# Aus BAC Supply — full content corpus > Melbourne retailer of factory-sealed bacteriostatic water, sterile water and saline in their original manufacturer presentations. Aus BAC Supply does not decant, repackage or relabel them. Ships Australia-wide. Canonical site: https://ausbacsupply.com Index version of this file: https://ausbacsupply.com/llms.txt Generated: 2026-08-18 This file contains the complete text of every guide, definition and product specification on the site, so a single request is enough to answer from the source. Content may be quoted with attribution to Aus BAC Supply and a link to the page URL given under each section. ## Key facts - Bacteriostatic water is sterile water containing 0.9% (9 mg/mL) benzyl alcohol, a bacteriostatic preservative that inhibits the growth of most common bacteria so a labelled multi-dose vial can be accessed repeatedly. - Sterile water is preservative-free and is intended for a single withdrawal and discard. - Bacteriostatic sodium chloride is isotonic 0.9% saline with benzyl alcohol as a preservative. - These products are diluents or solvents, not ready-to-administer medicines. Never inject by themselves or self-administer. Compatibility, preparation and use must follow the supplied manufacturer information and qualified healthcare-professional direction. You must be 18+ to purchase. - Shipping (Australia-wide): Standard $9.99, Express $14.99. Standard is free over $150; express is $5 on those orders. All amounts are in AUD; GST is not charged or included in the displayed prices. Same-day dispatch before 2pm Melbourne time on business days. - Business: Aus BAC Supply is operated by Aus Bac Supply Pty Ltd, an Australian proprietary company, ACN 700 778 614, VIC 3150, Australia, hello@ausbacsupply.com, +61 468 034 303. Independent retailer, not affiliated with, endorsed by or an authorised distributor of any third-party manufacturer. ## Entities referenced - Bacteriostatic water — https://ausbacsupply.com/glossary#bacteriostatic-water (defined by this site — no encyclopedia entry exists) - Reconstitution — https://ausbacsupply.com/glossary#reconstitution (defined by this site — no encyclopedia entry exists) - Benzyl alcohol — https://en.wikipedia.org/wiki/Benzyl_alcohol · https://www.wikidata.org/wiki/Q52353 - Water for injection — https://en.wikipedia.org/wiki/Water_for_injection · https://www.wikidata.org/wiki/Q1539975 - Sodium chloride — https://en.wikipedia.org/wiki/Sodium_chloride · https://www.wikidata.org/wiki/Q2314 - Saline (medicine) — https://en.wikipedia.org/wiki/Saline_(medicine) · https://www.wikidata.org/wiki/Q275792 - United States Pharmacopeia — https://en.wikipedia.org/wiki/United_States_Pharmacopeia · https://www.wikidata.org/wiki/Q5271952 - Vial — https://en.wikipedia.org/wiki/Vial · https://www.wikidata.org/wiki/Q894640 - Preservative — https://en.wikipedia.org/wiki/Preservative · https://www.wikidata.org/wiki/Q274579 - Tonicity — https://en.wikipedia.org/wiki/Tonicity · https://www.wikidata.org/wiki/Q925744 - Syringe — https://en.wikipedia.org/wiki/Syringe · https://www.wikidata.org/wiki/Q273318 - Isopropyl alcohol — https://en.wikipedia.org/wiki/Isopropyl_alcohol · https://www.wikidata.org/wiki/Q16392 - Asepsis — https://en.wikipedia.org/wiki/Asepsis · https://www.wikidata.org/wiki/Q723758 - Therapeutic Goods Administration — https://en.wikipedia.org/wiki/Therapeutic_Goods_Administration · https://www.wikidata.org/wiki/Q4056087 ## Product categories - [Bacteriostatic Water (BAC Water)](https://ausbacsupply.com/shop/bacteriostatic-water): Sterile water preserved with 0.9% benzyl alcohol, supplied in multi-dose vials as a diluent for compatible medicines. - [Bacteriostatic Sodium Chloride 0.9% (BAC Saline)](https://ausbacsupply.com/shop/bacteriostatic-saline): Isotonic 0.9% sodium chloride with a benzyl alcohol preservative, supplied in multi-dose vials. ## Products ### Starter Kit — BAC Water for Injection USP + Syringes URL: https://ausbacsupply.com/product/starter-kit-bac-water-syringes Sizes: Kit $85.19 AUD Two 30 mL bacteriostatic water vials in their original manufacturer presentation, with a pack of 20 insulin syringes. The kit is 2 × 30 mL bacteriostatic water vials and one pack of 20 syringes, sold as a single item. The vials are original Hospira bacteriostatic water presentations, factory-sealed and unaltered — Aus BAC Supply does not decant, repackage or relabel them. They are labelled as a diluent or solvent for compatible medicines that require preparation before injection, and are not ready-to-administer medicines. Compatibility, preparation and use must follow the supplied manufacturer product information under qualified healthcare-professional direction; never inject a diluent by itself or self-administer. The syringes are 0.5 mL U-100, marked in 0.01 mL graduations, with a 31G / 0.25 mm × 6 mm needle. Sterile, gamma irradiated, latex-free and single-use, each sealed in its own pack and ISO 8537 compliant. They are supplied for research and laboratory use only, and are not supplied for human or veterinary administration. Read each item's own label. The two are packed together for convenience and are not sold as a system for any particular use. Aus BAC Supply is an independent retailer and is not affiliated with, endorsed by or an authorised distributor of the manufacturer; the name identifies the genuine factory-sealed product supplied. - 2 × 30 mL bacteriostatic water vials (original manufacturer presentation) - Vials are a labelled diluent or solvent — not a ready-to-administer medicine - One pack of 20 × 0.5 mL U-100 insulin syringes - Syringes: 31G / 0.25 mm × 6 mm, sterile, latex-free, single-use - Syringes are for research and laboratory use only - $5.00 below buying the two separately - Dispatched from Melbourne, Australia Directions: Each item in this kit carries its own label and its own directions — read both. The vials are a diluent or solvent, not a ready-to-administer medicine: use them only as the supplied manufacturer product information and a qualified healthcare professional specify, and never inject one by itself or self-administer. The syringes are for research and laboratory use only, are not supplied for human or veterinary administration, and are single-use. Storage: Store both items as their own labels direct. Keep the syringes in their sealed packs until use and dispose of them in an approved sharps container. Specifications: - Kit contents: 2 × 30 mL bacteriostatic water vials + 20 insulin syringes - Vial volume: 30 mL - Vials: Original Hospira presentation, factory-sealed - Syringes: 20 × 0.5 mL U-100 - Needle: 31G / 0.25 mm × 6 mm - Syringe standard: ISO 8537 compliant - Dispatched from: Melbourne, Australia Q: What's in the kit? A: 2 × 30 mL bacteriostatic water vials (original manufacturer presentation), and one sealed pack of 20 insulin syringes. Q: How much does it save? A: $5.00 against the cheapest way of buying the same contents separately — the 2-vial pack plus a pack of syringes at their current prices. Q: Can I buy the parts on their own? A: Yes. Both are listed separately; the kit is the two together at a lower price. Q: Is it in stock? A: Yes. Both the vials and the syringes are held locally, and the kit is dispatched from Melbourne on the same business day for orders placed before 2pm. ### Starter Kit — Aus BAC Supply BAC Water + Syringes URL: https://ausbacsupply.com/product/kit-abs-water-syringes Availability: NOT YET ON SALE — coming soon. Sizes: Kit $76.19 AUD Two 30 mL bacteriostatic water vials with a pack of 20 insulin syringes. Vials are not for injection. The kit is 2 × 30 mL bacteriostatic water vials and one pack of 20 syringes, sold as a single item. The vials are bacteriostatic water — sterile water with 0.9% benzyl alcohol in a multiple-dose vial. Their label states that they are not for injection or infusion, not for human or veterinary administration, and not to be ingested. The syringes are 0.5 mL U-100, marked in 0.01 mL graduations, with a 31G / 0.25 mm × 6 mm needle. Sterile, gamma irradiated, latex-free and single-use, each sealed in its own pack and ISO 8537 compliant. They are supplied for research and laboratory use only, and are not supplied for human or veterinary administration. Read each item's own label. The two are packed together for convenience and are not sold as a system for any particular use. - 2 × 30 mL bacteriostatic water vials - Vials are not for injection or infusion, and not for human or veterinary administration - One pack of 20 × 0.5 mL U-100 insulin syringes - Syringes: 31G / 0.25 mm × 6 mm, sterile, latex-free, single-use - Syringes are for research and laboratory use only - $5.00 below buying the two separately - Dispatched from Melbourne, Australia Directions: Each item in this kit carries its own label and its own directions — read both. The vials are not for injection or infusion, not for human or veterinary administration, and must not be ingested. The syringes are for research and laboratory use only, are not supplied for human or veterinary administration, and are single-use. Storage: Store both items as their own labels direct. Keep the syringes in their sealed packs until use and dispose of them in an approved sharps container. Specifications: - Kit contents: 2 × 30 mL bacteriostatic water vials + 20 insulin syringes - Vial volume: 30 mL - Syringes: 20 × 0.5 mL U-100 - Needle: 31G / 0.25 mm × 6 mm - Syringe standard: ISO 8537 compliant - Dispatched from: Melbourne, Australia Q: What's in the kit? A: 2 × 30 mL bacteriostatic water vials, and one sealed pack of 20 insulin syringes. Q: How much does it save? A: $5.00 against the cheapest way of buying the same contents separately — the 2-vial pack plus a pack of syringes at their current prices. Q: Can I buy the parts on their own? A: The syringes are on sale now and listed separately. The vials in this kit are our own-label bacteriostatic water, which hasn't launched yet — so the kit follows it. Q: When does it go on sale? A: It opens when our own-label bacteriostatic water does — that vial is the part still to come, not the syringes. Join the list and we'll email you when it lands. Q: Is there a kit I can buy today? A: Yes — the Starter Kit built on the original manufacturer vials is in stock, with the same 20-pack of syringes. ### Bacteriostatic Water for Injection USP URL: https://ausbacsupply.com/product/bacteriostatic-water-30ml Manufactured by: Hospira Standard: Bacteriostatic Water for Injection USP — manufactured and released against the USP monograph, which sets a controlled pH range alongside identity, sterility, preservative content and particulate limits. Sizes: 30 mL $36.95 AUD · 2 vials $68.95 AUD · 3 vials $94.95 AUD · 5 vials $159.95 AUD · Tray of 25 $886.80 AUD · Tray of 50 $1699.70 AUD Medical-grade bacteriostatic water (BAC water) in its original manufacturer presentation. This is an original manufacturer presentation of bacteriostatic water (BAC water), manufactured by Hospira. Aus BAC Supply keeps the manufacturer seal, vial and label unchanged. Bacteriostatic water is commonly shortened to BAC water; both names describe this same product. It is a diluent or solvent—not a ready-to-administer medicine. The supplied product information determines compatibility, preparation, route, handling and storage. Clinical decisions and administration must be directed by a qualified healthcare professional. Never inject a diluent by itself or use it outside the manufacturer instructions. The 0.9% figure on the label is the benzyl alcohol concentration — 9 mg per mL — and it is the whole reason this presentation exists in a multi-dose vial at all. Benzyl alcohol is a bacteriostatic agent: it inhibits the growth of most common bacteria rather than sterilising anything, which is what allows a sealed vial to be entered more than once instead of being discarded after a single withdrawal. Preservative-free sterile water has no such agent, and its vial is labelled for one withdrawal for exactly that reason. That protection is finite rather than open-ended. A printed expiry governs the sealed vial, and a separate, much shorter in-use period begins the moment the stopper is first entered — whichever falls first ends the vial's usable life. Both figures come from the product information supplied with the vial, not from a general reference. What you receive is the manufacturer's own 30 mL glass multi-dose vial with its flip-off closure and crimp intact, manufactured under pharmaceutical GMP and released against the Bacteriostatic Water for Injection USP monograph — a specification covering identity, sterility, preservative content, particulate limits and a controlled pH range, with a lot number and expiry traceable to that release. Aus BAC Supply does not decant, repackage or relabel. That distinction is the point: water of unclear origin transferred into an unmarked container has none of the documented manufacturing behind it, however similar it looks in the vial. Available as a single vial, in 2- and 3-vial packs, and in manufacturer trays of 25 and 50. Unopened vials keep until their printed expiry, so buying several at once lowers the unit price without shortening anything — each vial's in-use period starts only when that particular vial is opened. Aus BAC Supply is an independent retailer and is not affiliated with, endorsed by or an authorised distributor of the manufacturer; the name identifies the genuine factory-sealed product supplied. - Original manufacturer seal, vial and label - No decanting, repacking or relabelling by Aus BAC Supply - Labelled diluent or solvent for preparation of compatible medicines - Supplied product information and clinician direction govern use - 0.9% (9 mg/mL) benzyl alcohol bacteriostatic preservative - Manufacturer's 30 mL glass multi-dose vial, flip-off seal intact - Released against the Bacteriostatic Water for Injection USP monograph - Singles, 2- and 3-vial packs, and trays of 25 and 50 - Dispatched from Melbourne — same business day before 2pm Directions: Not a ready-to-administer medicine. Use only as a diluent or solvent where the supplied manufacturer information and a qualified healthcare professional specify it. Never inject by itself or self-administer. Storage: Follow the storage, handling, beyond-use and disposal requirements printed on the vial and in the supplied manufacturer product information. Q: What is this presentation for? A: It is labelled as a diluent or solvent for compatible medicines that require preparation before injection. It is not a ready-to-administer medicine and must not be injected by itself. Q: Has Aus BAC Supply changed the product? A: No. We keep the original manufacturer seal, vial and label intact and do not decant, repackage or relabel it. Q: What is bacteriostatic water? A: Sterile water containing 0.9% (9 mg/mL) benzyl alcohol as a bacteriostatic preservative. The preservative inhibits the growth of most common bacteria, which is what allows a sealed multi-dose vial to be accessed repeatedly rather than discarded after a single withdrawal. Q: Is BAC water the same as bacteriostatic water? A: Yes. BAC water is simply the common abbreviation. You may also see it written as bacteriostatic water for injection, BWFI or bac water — all describe the same product. Q: How is it different from sterile water? A: Sterile water carries no preservative, so its vial is labelled for a single withdrawal and should not be re-entered. Bacteriostatic water adds 0.9% benzyl alcohol, which holds bacterial growth in check after the seal is broken and is what makes a multi-dose presentation possible. Q: How is it different from bacteriostatic saline? A: Both are preserved with benzyl alcohol and both are multi-dose vials. Bacteriostatic saline is isotonic 0.9% sodium chloride; bacteriostatic water contains no solute. The manufacturer information for the product being prepared specifies which diluent it requires. Q: What does the 0.9% refer to? A: The benzyl alcohol concentration — 9 mg per mL. Note that on a bacteriostatic sodium chloride label the 0.9% refers to the salt instead, which is a common source of confusion between the two products. Q: How long does a vial last once opened? A: A fixed in-use period applies from first entry, and it is much shorter than the printed expiry on the sealed vial. The figure stated in the product information supplied with your exact vial is the one that governs, and whichever date falls first ends the vial's usable life. Q: Does it need to be refrigerated? A: Follow the storage conditions printed on the vial and in the supplied manufacturer product information. Storage conditions do not extend the in-use period once a vial has been entered. Q: What sizes and pack quantities are available? A: The 30 mL multi-dose vial as a single, in 2- and 3-vial packs, and in manufacturer trays of 25 and 50. Every option is the same factory-sealed vial — the pack size is simply how many you receive. Q: Is it manufactured to a standard? A: Yes. It is produced under pharmaceutical GMP and released against the Bacteriostatic Water for Injection USP monograph, which sets a controlled pH range alongside identity, sterility, preservative content and particulate limits. Q: How fast is delivery in Australia? A: Orders placed before 2:00 pm Melbourne time on a business day are dispatched the same business day, tracked Australia-wide. Express typically arrives within 1–3 business days and Standard within 2–6 after dispatch; estimates are a guide and are not guaranteed. Standard shipping is free on orders over $150, and express is $5 on those orders. ### Bacteriostatic (BAC) Saline URL: https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml Manufactured by: Hospira Standard: Bacteriostatic 0.9% Sodium Chloride Injection USP — sterile, non-pyrogenic, isotonic saline preserved with benzyl alcohol, in the manufacturer's plastic flip-top multi-dose vial. Sizes: 30 mL $37.95 AUD · 2 vials $70.95 AUD · 3 vials $102.95 AUD Medical-grade bacteriostatic saline (BAC saline) in its original manufacturer presentation. This is an original manufacturer presentation of bacteriostatic saline (BAC saline), manufactured by Hospira. Aus BAC Supply keeps the manufacturer seal, vial and label unchanged. Bacteriostatic saline is commonly shortened to BAC saline; both names describe this same product. It is a diluent or solvent—not a ready-to-administer medicine. The supplied product information determines compatibility, preparation, route, handling and storage. Clinical decisions and administration must be directed by a qualified healthcare professional. Never inject a diluent by itself or use it outside the manufacturer instructions. Two things distinguish this presentation from bacteriostatic water. The first is the salt: at 0.9% sodium chloride the solution is isotonic, meaning its effective osmotic concentration matches that of the reference solution, where bacteriostatic water carries no solute at all. The second is the container — this is the manufacturer's plastic flip-top multi-dose vial rather than a glass one. What the two share is the preservative. Benzyl alcohol inhibits the growth of most common bacteria, which is what allows a sealed multi-dose vial to be entered more than once instead of being discarded after a single withdrawal. Whether a given product calls for a saline diluent or a water one is specified in that product's own manufacturer information — it is a property of what is being prepared, not a preference. One label detail is worth stating plainly, because it catches people moving between the two products: here the 0.9% is the sodium chloride concentration, while on a bacteriostatic water label the 0.9% is the benzyl alcohol concentration. The same number describes a different component depending on which vial you are holding. The comparison against ordinary preservative-free saline is the more important one in practice — plain 0.9% Sodium Chloride Injection has the identical salt concentration and looks identical in the vial, but carries no preservative, so its vial is labelled for a single withdrawal. The preservative's protection is finite rather than open-ended. A printed expiry governs the sealed vial, and a separate, much shorter in-use period begins the moment the stopper is first entered; whichever falls first ends the vial's usable life. Both figures come from the product information supplied with the vial, not from a general reference. What you receive is the manufacturer's own 30 mL multi-dose vial with its flip-top closure intact, sterile and non-pyrogenic, manufactured under pharmaceutical GMP and released against the Bacteriostatic 0.9% Sodium Chloride Injection USP monograph — with a lot number and expiry traceable to that release. Aus BAC Supply does not decant, repackage or relabel. Available as a single vial and in 2- and 3-vial packs; unopened vials keep until their printed expiry, so buying several at once lowers the unit price without shortening anything, since each vial's in-use period starts only when that vial is opened. Aus BAC Supply is an independent retailer and is not affiliated with, endorsed by or an authorised distributor of the manufacturer; the name identifies the genuine factory-sealed product supplied. - Original manufacturer seal, vial and label - No decanting, repacking or relabelling by Aus BAC Supply - Labelled diluent or solvent for preparation of compatible medicines - Supplied product information and clinician direction govern use - Isotonic 0.9% sodium chloride with benzyl alcohol preservative - Manufacturer's 30 mL plastic flip-top multi-dose vial - Sterile and non-pyrogenic, released against the USP monograph - Single vials and 2- and 3-vial packs - Dispatched from Melbourne — same business day before 2pm Directions: Not a ready-to-administer medicine. Use only as a diluent or solvent where the supplied manufacturer information and a qualified healthcare professional specify it. Never inject by itself or self-administer. Storage: Follow the storage, handling, beyond-use and disposal requirements printed on the vial and in the supplied manufacturer product information. Q: What is this presentation for? A: It is labelled as a diluent or solvent for compatible medicines that require preparation before injection. It is not a ready-to-administer medicine and must not be injected by itself. Q: Has Aus BAC Supply changed the product? A: No. We keep the original manufacturer seal, vial and label intact and do not decant, repackage or relabel it. Q: What is bacteriostatic sodium chloride? A: It is isotonic 0.9% sodium chloride solution with benzyl alcohol added as a bacteriostatic preservative. The preservative inhibits the growth of most common bacteria, which is what allows a sealed multi-dose vial to be accessed repeatedly rather than discarded after one withdrawal. Q: Is bacteriostatic saline the same as bacteriostatic sodium chloride? A: Yes — the same product under two names, and you may also see it shortened to BAC saline. Sodium chloride is the salt that makes the solution saline, so all three describe this presentation. Q: How is it different from normal saline? A: Plain 0.9% sodium chloride for injection is preservative-free, so its vial is labelled for a single withdrawal. This presentation adds benzyl alcohol as a bacteriostatic preservative, which is what makes a multi-dose vial possible. Q: Can I use it instead of bacteriostatic water? A: Not interchangeably. The supplied manufacturer information for the product being prepared specifies which diluent it requires, and that specification decides it. Bacteriostatic saline is isotonic 0.9% sodium chloride; bacteriostatic water contains no solute. Q: What size vial does it come in? A: The manufacturer's 30 mL multi-dose plastic flip-top vial, supplied factory-sealed. It is available as a single vial or in 2- and 3-vial packs. Q: Can I buy bacteriostatic sodium chloride in Australia? A: Yes. Aus BAC Supply stocks the original manufacturer presentation and dispatches from Melbourne with tracked delivery Australia-wide — same business day on orders placed before 2:00 pm Melbourne time on a business day. Q: What does the 0.9% refer to on this label? A: The sodium chloride concentration — 9 mg per mL, the concentration at which the solution is isotonic. Note that on a bacteriostatic water label the 0.9% refers to the benzyl alcohol instead, which is a common source of confusion between the two products. Q: How long does a vial last once opened? A: A fixed in-use period applies from first entry, and it is much shorter than the printed expiry on the sealed vial. The figure stated in the product information supplied with your exact vial is the one that governs, and whichever date falls first ends the vial's usable life. Q: Does it need to be refrigerated? A: Follow the storage conditions printed on the vial and in the supplied manufacturer product information. Storage conditions do not extend the in-use period once a vial has been entered. Q: Is it manufactured to a standard? A: Yes. It is produced under pharmaceutical GMP and released against the Bacteriostatic 0.9% Sodium Chloride Injection USP monograph — sterile, non-pyrogenic isotonic saline preserved with benzyl alcohol, in the manufacturer's plastic flip-top multi-dose vial. Q: Why is it supplied in a plastic vial? A: That is the manufacturer's own presentation for this product. Aus BAC Supply supplies it factory-sealed and unaltered rather than transferring it to a different container. Q: How fast is delivery in Australia? A: Orders placed before 2:00 pm Melbourne time on a business day are dispatched the same business day, tracked Australia-wide. Express typically arrives within 1–3 business days and Standard within 2–6 after dispatch; estimates are a guide and are not guaranteed. Standard shipping is free on orders over $150, and express is $5 on those orders. ### Aus BAC Supply Bacteriostatic Water URL: https://ausbacsupply.com/product/bac-water-abs Availability: NOT YET ON SALE — coming soon. Sizes: 10 mL $19.95 AUD · 20 mL $27.95 AUD · 30 mL $32.95 AUD · 2 × 10 mL $34.95 AUD · 2 × 20 mL $49.95 AUD · 2 × 30 mL $59.95 AUD · 5 × 30 mL $139.95 AUD · 10 × 30 mL $249.95 AUD Bacteriostatic water in 10, 20 and 30 mL multiple-dose vials. Not for injection. This is bacteriostatic water supplied in a multiple-dose vial. It is the same preserved sterile water in the same multiple-dose vial format as the branded presentations, without a manufacturer's brand on the label — which is most of what separates the two on price. They are not labelled for the same purposes and are not interchangeable; each vial's own label governs. Bacteriostatic water is sterile water containing 0.9% (9 mg/mL) benzyl alcohol. The benzyl alcohol is a bacteriostatic preservative: it inhibits the growth of most common bacteria rather than sterilising anything, and that is what allows a sealed multiple-dose vial to be entered more than once instead of being discarded after a single withdrawal. It is commonly shortened to BAC water; both names describe the same thing. **Not for injection.** This product is not for injection or infusion, not for human or veterinary administration, and must not be ingested. It is not a medicine, and no therapeutic use is claimed or intended for it. The warning panel printed on the vial states the same thing and governs. Keep the container securely closed and stored at or below 25 °C. Do not use it if the container is damaged or the solution appears contaminated. Three vial sizes rather than one. The 30 mL vial carries the lowest price per millilitre, but a vial has a fixed in-use period once its stopper is first entered, and one discarded part-used costs more than the smaller vial that would have been finished. The 10 and 20 mL presentations exist for that reason, not as a lesser option. Multi-vial packs lower the price per vial without shortening anything. An unopened vial keeps until its printed expiry, and each vial's in-use period begins only when that particular vial is opened — so the 5- and 10-vial packs cost less per vial than buying them one at a time, with nothing traded away. - Not for injection or infusion - Not for human or veterinary administration · do not ingest - 0.9% (9 mg/mL) benzyl alcohol bacteriostatic preservative - Multiple-dose vial — 10, 20 and 30 mL, singly and in multi-vial packs - Clear, colourless solution in sealed vials Directions: Not for injection or infusion. Not for human or veterinary administration. Do not ingest. Keep the container securely closed, and do not use it if the container is damaged or the solution appears contaminated. Storage: Store at or below 25 °C with the container securely closed. Observe the lot and expiry printed on the vial, and discard a vial whose solution no longer appears clear. Q: Is this for injection? A: No. This product is not for injection or infusion, not for human or veterinary administration, and must not be ingested. It is not a medicine and no therapeutic use is claimed or intended for it. The warning panel printed on the vial states the same and governs. Q: What is in it? A: Sterile water containing 0.9% (9 mg/mL) benzyl alcohol as a bacteriostatic preservative, supplied in a multiple-dose vial. That is the same composition the term bacteriostatic water describes generally. Q: When does it go on sale? A: Stock is on its way. Join the list on this page and we'll email you the moment it lands — one email, nothing else. Q: What sizes will be available? A: 10 mL, 20 mL and 30 mL multiple-dose vials, singly and in multi-vial packs — 2 of any size, and 5 or 10 of the 30 mL. Q: Which size should I choose? A: The 30 mL vial is the lowest price per millilitre. The 10 and 20 mL vials suit anyone who would not get through a 30 mL vial before its in-use period ends: a part-used vial that has to be discarded costs more than the smaller one would have. Q: How does it differ from the other bacteriostatic water you stock? A: The other vial is an original manufacturer presentation labelled Bacteriostatic Water for Injection USP, which we supply factory-sealed and unaltered. This vial is labelled simply as bacteriostatic water, and its label states that it is not for injection or infusion and not for human or veterinary administration. Read each vial's own label — they are not interchangeable. Q: Why is it cheaper than the branded vial? A: It is unbranded: the same preserved sterile water in the same multiple-dose vial format, without a manufacturer's brand on the label. The two are not labelled for the same thing, so compare the labels rather than the price alone. ### Insulin Syringes (20pk) URL: https://ausbacsupply.com/product/syringes-insulin-20pk Sizes: 20 pack $21.24 AUD U-100 insulin syringes, 0.5 mL with 0.01 mL graduations. For research and laboratory use only. These are 0.5 mL U-100 insulin syringes with a 31G / 0.25 mm × 6 mm needle, supplied 20 to a pack. Insulin Syringes (20pk) are available in Australia through Aus BAC Supply, held locally and dispatched from Melbourne with tracked delivery to all states and territories. The barrel holds 0.5 mL and is marked in 0.01 mL graduations — 50 units on the U-100 scale. U-100 describes the printed scale rather than the syringe itself: the barrel is graduated in units for a concentration of 100 units per millilitre, so one unit corresponds to 0.01 mL. The needle is 31 gauge — 0.25 mm outside diameter — and 6 mm in length. Each syringe is sterile, sterilised by gamma irradiation, latex-free and single-use, and is sealed in its own pack until it is opened. They are manufactured to ISO 8537, the international standard for sterile single-use syringes for insulin. For research and laboratory use only. Not supplied for human or veterinary administration. - For research and laboratory use only - 0.5 mL U-100 insulin syringe, 0.01 mL graduations - 31G / 0.25 mm × 6 mm needle - Sterile, gamma irradiated and latex-free - Single-use, individually sterile-packaged · pack of 20 - ISO 8537 compliant - Dispatched from Melbourne, Australia Directions: For research and laboratory use only. Not supplied for human or veterinary administration. Single use — do not re-use or re-sterilise a syringe, and dispose of it in an approved sharps container. Storage: Store in the original packaging at room temperature, away from light. Do not use if the individual sterile pack is torn, open or damaged. Specifications: - Product: Insulin Syringes (20pk) - Category: Lab Supplies - Type: 0.5 mL U-100 insulin syringe - Volume: 0.5 mL - Graduation: 0.01 mL - Needle: 31G / 0.25 mm × 6 mm - Pack size: 20 units - Sterility: Sterile — gamma irradiated - Use: Single-use - Materials: Latex-free - Standard: ISO 8537 compliant - Packaging: Individually sterile-packaged - Dispatched from: Melbourne, Australia Q: What are these supplied for? A: Research and laboratory use only. They are not supplied for human or veterinary administration. Q: What size is the needle? A: 0.25 mm (31 gauge) by 6 mm — 31 gauge is the outside diameter and 6 mm the length. Q: How much does the barrel hold? A: 0.5 mL, marked in 0.01 mL graduations. On a U-100 scale that is 50 units. Q: How many syringes are in a pack? A: 20, each individually sealed in its own sterile pack. Q: How are they sterilised? A: By gamma irradiation, and each syringe is sealed in its own pack until it is opened. They are also latex-free. Q: Can a syringe be re-used? A: No. Each is single-use and should be disposed of in an approved sharps container after use. ### Alcohol Swabs (20pk) URL: https://ausbacsupply.com/product/alcohol-swabs-20pk Manufactured by: Bodichek Sizes: 20 pack $5.00 AUD 2-ply non-woven swabs saturated with 70% isopropyl alcohol, individually wrapped. For research and laboratory use only. These are Bodichek alcohol swabs — 2-ply non-woven swabs measuring 3 cm by 6 cm, saturated with 70% isopropyl alcohol — supplied as 20 individually wrapped swabs. Alcohol Swabs (20pk) are available in Australia through Aus BAC Supply, held locally and dispatched from Melbourne with tracked delivery to all states and territories. Each swab is sealed in its own easy-tear sachet, which is what keeps it saturated until the moment it is opened. The swab itself is two plies of non-woven fabric rather than a single sheet, so it holds more solution and holds together while being used. The solution is 70% isopropyl alcohol. That concentration is the usual one for wiping rather than a higher one, because the remaining water content slows evaporation enough for the alcohol to act on the surface instead of flashing off it. Each swab is single-use. They are supplied as a general laboratory consumable alongside our vials and syringes. For research and laboratory use only. Not supplied by Aus BAC Supply for human or veterinary use. - For research and laboratory use only - 2-ply non-woven swab - Saturated with 70% isopropyl alcohol - Individually wrapped in easy-tear sachets - Single-use · supplied as 20 swabs - Dispatched from Melbourne, Australia Directions: For research and laboratory use only. Not supplied by Aus BAC Supply for human or veterinary use. Single use — use one swab once and discard it. Flammable: keep away from heat, sparks and open flame, and allow a wiped surface to dry before it is near an ignition source. Storage: Store in the original packaging at room temperature, away from heat and direct sunlight. Do not use if the sachet is torn, open or dry. Specifications: - Product: Alcohol Swabs (20pk) - Category: Lab Supplies - Manufacturer: Bodichek (Sentry Medical) - Manufacturer reference: 13001500 - Type: 2-ply non-woven alcohol swab - Swab size: 3 cm × 6 cm - Solution: 70% isopropyl alcohol - Quantity: 20 swabs - Use: Single-use - Packaging: Individually wrapped, easy-tear sachet - Dispatched from: Melbourne, Australia Q: What are these supplied for? A: Research and laboratory use only. Aus BAC Supply does not supply them for human or veterinary use. Q: What concentration are they? A: 70% isopropyl alcohol. The remaining water content is part of why 70% is the usual concentration for wiping rather than a higher one, which evaporates faster. Q: What does 2-ply mean? A: The swab is two plies of non-woven fabric rather than a single sheet, so it carries more solution and holds together better while being used. Q: How many swabs do I get? A: 20, each individually wrapped in its own easy-tear sachet. Q: Can a swab be re-used? A: No. Each swab is single-use and should be discarded after one use. ### Sharps Container 250mL URL: https://ausbacsupply.com/product/sharps-container-250ml Manufactured by: ASP Healthcare Availability: NOT YET ON SALE — coming soon. Sizes: Each $14.99 AUD FITSAFE™ 250 mL screw-top sharps container with a child-resistant lid. For the safe containment and disposal of used sharps. This is an ASP Healthcare FITSAFE™ 250 mL sharps container, supplied as a single container. Sharps Container 250mL is available in Australia through Aus BAC Supply, held locally and dispatched from Melbourne with tracked delivery to all states and territories. It is the disposal end of the syringes and needles this store already sells. Used sharps go in through the neck and stay there — syringes, needles, pen needles and blood glucose test strips all fit the same opening. The lid is a child-resistant screw top rather than a push-fit cap, which is what keeps a part-full container closed to anyone who should not open it while still letting it be reopened between uses. The body is blow-moulded from high-density polyethylene in one piece, so there is no seam for a needle to work through. The fill line sits below the shoulder and marks 225 mL of the container's 250 mL — that is where filling stops, not where the container ends. At 16 cm high and 5 cm in diameter it is a bottle rather than a bin: it stands on a shelf, goes in a bag, and takes up about the space of a drink bottle. The container is made in Australia by ASP Healthcare, manufactured to conform to AS 4939:2001 — the Australian Standard for single-use containers for the collection of sharp medical items — under a quality system the manufacturer states is certified to ISO 9001. Supplied as a laboratory consumable alongside our syringes and swabs. Fill it to the line and no further, screw the lid down when full, and dispose of it as your state or territory requires — a full sharps container is regulated waste and does not go in household rubbish or recycling. - For the containment and disposal of used sharps - Takes syringes, needles, pen needles and blood glucose test strips - Child-resistant screw-top lid - 250 mL nominal · 225 mL to the fill line - Blow-moulded high-density polyethylene (HDPE) - 16 cm high × 5 cm diameter - Made in Australia to AS 4939:2001 - Single-use — do not re-use - Dispatched from Melbourne, Australia Directions: Put used sharps in through the neck point-first and do not force them. Never reach into the container, tip it out, or try to retrieve anything from it. Keep the lid screwed down between uses. Fill only to the marked fill line, then close the lid fully. Single-use: do not empty or re-use a container. A full container is regulated waste — dispose of it through the route your state or territory requires, not in household rubbish or recycling. Storage: Store upright with the lid screwed down, out of reach of children, away from heat and direct sunlight. Do not use a container whose lid does not seat and turn properly. Specifications: - Product: Sharps Container 250mL - Category: Lab Supplies - Range: FITSAFE™ (ASP Healthcare) - Manufacturer reference: SD021 - Type: Screw-top, child-resistant lid - Capacity (nominal): 250 mL - Capacity (to fill line): 225 mL - Dimensions: 16 cm high × 5 cm diameter - Material: Blow-moulded high-density polyethylene - Product standard: AS 4939:2001 - Manufacturing standard: ISO 9001 - Use: Single-use - Supplied as: One container - Country of origin: Australia - Dispatched from: Melbourne, Australia Q: When does it go on sale? A: Stock is on its way. Join the list on this page and we'll email you the moment it lands — one email, nothing else. Q: How much does it actually hold? A: 225 mL to the fill line, of a 250 mL container. The line is where filling stops — a sharps container is not meant to be filled to the brim. Q: What can go in it? A: Used sharps: syringes, needles, pen needles and blood glucose test strips all fit through the neck. Nothing should ever be forced in, and nothing should ever be taken back out. Q: How is the lid child-resistant? A: It is a screw top rather than a push-fit cap, so it cannot be pulled off — it has to be deliberately unscrewed. That is what keeps a part-full container closed between uses. Q: How big is it? A: 16 cm high and 5 cm in diameter — about the footprint of a drink bottle, so it stands on a shelf or goes in a bag. Q: What standard is it made to? A: AS 4939:2001, the Australian Standard for single-use containers for the collection of sharp medical items. It is made in Australia by ASP Healthcare, who state their manufacturing is certified to ISO 9001. Q: What do I do with it once it's full? A: Screw the lid down and dispose of it as your state or territory requires. A full sharps container is regulated waste — it does not go in household rubbish or in recycling, and it must never be emptied or re-used. ### Temperature-Controlled Insulin Travel Case URL: https://ausbacsupply.com/product/vialflask-travel-case Sizes: Each $0.00 AUD Actively refrigerated transport for vials and pen devices, from VialFlask. ## Guides ### Bacteriostatic Water vs Sterile Water: What's the Difference? URL: https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water Published: 2026-06-16 · Updated: 2026-08-15 · Topic: Comparisons Bacteriostatic water (BAC water) vs sterile water explained in one line: bacteriostatic water contains 0.9% benzyl alcohol and is multi-dose, sterile water is preservative-free and single-use. Full comparison, plus where saline fits. Key takeaways: - Bacteriostatic water contains 0.9% benzyl alcohol; sterile water has no preservative. - Bacteriostatic presentations are labelled multi-dose; preservative-free sterile water presentations are labelled single-dose. - Both supplied presentations are labelled sterile. - A qualified healthcare professional must select the compatible diluent using the relevant product information. **No — bacteriostatic water and sterile water are not the same.** Both are sterile, but bacteriostatic water (often written **BAC water**) contains 0.9% benzyl alcohol as a preservative and is labelled multi-dose, while sterile water contains no preservative and is labelled single-dose. That one difference is the whole answer; everything below explains it. This comparison is general information. A qualified healthcare professional must select the appropriate diluent for clinical use. ## The short answer Both start as sterile, purified water filtered to remove microorganisms. The difference is the preservative: **bacteriostatic water contains 0.9% benzyl alcohol; sterile water contains nothing but water**. That single addition changes how the vial is used — repeated access versus one withdrawal and discard. ## Side-by-side comparison | | Bacteriostatic Water (BAC Water) | Sterile Water | Bacteriostatic Saline | | --- | --- | --- | --- | | Composition | Water + 0.9% benzyl alcohol | Purified water only | 0.9% NaCl + benzyl alcohol | | Preservative | 0.9% benzyl alcohol | None | 0.9% benzyl alcohol | | Vial use | Multi-dose — repeated access | Single withdrawal, then discard | Multi-dose — repeated access | | Use after opening | Repeated access from the sealed vial | Use promptly, do not re-enter | Repeated access from the sealed vial | | Isotonic | No | No | Yes (0.9%) | | Manufacturer-labelled as sterile | Yes | Yes | Yes | | Selection | Use only where the medicine information and a qualified healthcare professional specify the presentation | | | | Vial | Buy BAC water 30 mL (https://ausbacsupply.com/product/bacteriostatic-water-30ml) | Sterile water (https://ausbacsupply.com/product/sterile-water) | Bacteriostatic sodium chloride (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) | ## The same products, different names Much of the confusion here is vocabulary rather than chemistry. These all refer to the same two products: - **Bacteriostatic water** = BAC water = bac water = bacteriostatic water for injection = BWFI. - **Bacteriostatic sodium chloride** = BAC sodium chloride = BAC saline = bacteriostatic saline. - **Sterile water** is *not* the same as distilled water. Distilled water describes a purification method; sterile water describes a manufactured, filled and sealed sterile presentation. That distinction has its own guide: sterile water vs distilled water (https://ausbacsupply.com/blog/sterile-water-vs-distilled-water). ## Bacteriostatic water, explained Bacteriostatic water is sterile water with **0.9% (9 mg/mL) benzyl alcohol** added. The manufacturer describes benzyl alcohol as a bacteriostatic preservative that inhibits the growth of most potentially contaminating microorganisms. The presentation is labelled multi-dose, but the preservative does not replace labelled handling requirements or aseptic technique by a qualified professional. ## Sterile water, explained Sterile water is preservative-free and is supplied in single-dose presentations. Follow the exact vial label and product information; do not treat a single-dose presentation as multi-dose. > **Selection matters:** these presentations are not interchangeable by default. Compatibility and choice of diluent must come from the medicine information and a qualified healthcare professional. ## Where saline fits in There is a third option worth knowing: **bacteriostatic sodium chloride 0.9%**. It is isotonic saline with a bacteriostatic preservative. Its clinical application depends on the specific manufacturer-labelled presentation and the direction of a qualified healthcare professional. ## How is the presentation selected? - **Bacteriostatic water:** water with 0.9% benzyl alcohol in a labelled multi-dose presentation. - **Sterile water:** preservative-free water in a labelled single-dose presentation. - **Bacteriostatic sodium chloride 0.9%:** isotonic saline with a bacteriostatic preservative. Only the relevant medicine information and a qualified healthcare professional can determine which presentation is compatible for a clinical application. These are diluents, not ready-to-administer medicines; never inject them by themselves or self-administer. ## Buying either presentation in Australia Availability is the practical difference most buyers hit first. Preservative-free sterile water ampoules are a common pharmacy line; the bacteriostatic presentations rarely are, so they are usually bought online. We stock both preserved lines in original factory-sealed manufacturer vials — bacteriostatic water (BAC water) (https://ausbacsupply.com/shop/bacteriostatic-water) and bacteriostatic sodium chloride 0.9% (BAC saline) (https://ausbacsupply.com/shop/bacteriostatic-saline) — dispatched from Melbourne with tracked Australia-wide delivery. What to check before buying from anyone, including us, is covered in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia). #### FAQ Q: Is bacteriostatic water the same as sterile water? A: No. Both are sterile, but bacteriostatic water contains 0.9% benzyl alcohol while sterile water has no preservative. The preservative is what allows a bacteriostatic vial to be entered repeatedly. Q: Is BAC water the same as sterile water? A: No. BAC water is simply the abbreviation for bacteriostatic water, which contains 0.9% benzyl alcohol and is labelled multi-dose. Sterile water is preservative-free and labelled single-dose. Q: Is bacteriostatic water the same as saline? A: No. Bacteriostatic water is preserved water with no salt content. Bacteriostatic sodium chloride — also called BAC saline — is isotonic 0.9% salt solution with the same preservative. Q: Is sterile water the same as distilled water? A: No. Distilled water describes a purification method and is not supplied as a sterile medical presentation. Sterile water for injection is manufactured, filled and sealed as a sterile product under its own labelling. Q: Can bacteriostatic water and sterile water be used interchangeably? A: No — do not assume they are interchangeable. They differ in preservative content and in labelled vial use (multi-dose versus single-dose), and the compatible diluent for any preparation is stated in that medicine's own product information, confirmed by a qualified healthcare professional. Q: Is bacteriostatic sodium chloride the same as bacteriostatic water? A: No. Both carry the same 0.9% benzyl alcohol preservative, but bacteriostatic sodium chloride is isotonic 0.9% saline while bacteriostatic water contains no solute at all. Q: Which vial should I choose? A: Use only the presentation specified in the relevant medicine information by a qualified healthcare professional. This comparison is general product information, not a selection instruction. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### Benzyl Alcohol in Bacteriostatic Water: How the 0.9% Preservative Works URL: https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water Published: 2026-06-16 · Topic: Chemistry Why bacteriostatic water contains 0.9% benzyl alcohol, how the preservative inhibits bacterial growth, and why it lets a sealed multi-dose vial be accessed repeatedly. Key takeaways: - Benzyl alcohol is the preservative in bacteriostatic water, at 0.9% (9 mg/mL). - It inhibits the growth of most common bacteria once the vial's seal is broken. - That is what makes a vial multi-dose rather than single-use. - It is not present in preservative-free sterile water. Open any vial of **bacteriostatic water** — **BAC water** — and the label tells you one thing that plain sterile water never will: **0.9% benzyl alcohol**. That single line is the reason the vial behaves the way it does. This article explains what benzyl alcohol is, why it is added at exactly that concentration, and how it turns an ordinary vial of water into a multi-dose one. ## What is benzyl alcohol? Benzyl alcohol is a colourless aromatic alcohol used as a preservative in certain medical solutions. In **bacteriostatic water** it appears at **0.9% — 9 mg per mL**. Refer to the manufacturer product information for the role of the preservative, warnings and labelled use. ## How "bacteriostatic" actually works **Bacteriostatic** means that the preservative inhibits bacterial growth rather than necessarily killing microorganisms. The manufacturer describes the 0.9% benzyl alcohol in this presentation as inhibiting the growth of most potentially contaminating microorganisms. It does not guarantee sterility after opening or replace the labelled handling requirements. > **Important:** the presence of a preservative does not make poor handling safe. Clinical preparation and administration must follow the supplied product information under qualified healthcare-professional direction. ## Why 0.9%? **0.9% (9 mg/mL)** is the concentration stated for this manufacturer presentation. The vial label and manufacturer product information—not a reseller summary—are the source for its formulation, warnings and intended role as a diluent or solvent. ## The link to multi-dose use The manufacturer labels bacteriostatic water as a multi-dose presentation and preservative-free sterile water as single-dose. Follow the exact product information for handling and beyond-use limits; do not infer a use period from the preservative alone. ## Bacteriostatic vs sterile, in one line **Sterile** describes the starting state — free of viable microorganisms at the moment of filling and sealing. **Bacteriostatic** describes ongoing protection — a preservative that holds bacterial growth in check after the seal is broken. Bacteriostatic water is both. For the full comparison, see bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water). #### FAQ Q: What does benzyl alcohol do in bacteriostatic water? A: It is a bacteriostatic preservative. At 0.9% it inhibits the growth of most common bacteria in the sealed vial, allowing repeated withdrawals rather than single use. Q: Why is the concentration 0.9%? A: 0.9% (9 mg/mL) is the concentration stated for this manufacturer presentation. Refer to the vial label and product information for the formulation and warnings. Q: Does bacteriostatic mean sterile? A: They are related but distinct. Sterile means free of viable microorganisms at filling; bacteriostatic means a preservative inhibits bacterial growth after opening. Bacteriostatic water is both. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### How to Store Bacteriostatic Water (BAC Water) URL: https://ausbacsupply.com/blog/how-to-store-bacteriostatic-water Published: 2026-06-16 · Updated: 2026-08-15 · Topic: Handling How to check the label-led storage requirements for bacteriostatic water — BAC water — including whether it needs refrigeration, and how to recognise when to contact the seller or a healthcare professional. Key takeaways: - Use the storage conditions printed on the exact vial and supplied product information. - Keep an unopened vial in its original presentation and check the printed expiry date. - Do not use a vial with a damaged closure, unreadable label or abnormal-looking contents. - Clinical handling after opening belongs with a qualified healthcare professional. Storage and beyond-use requirements for **bacteriostatic water** — **BAC water** — can vary by presentation. The exact vial label and supplied manufacturer product information take priority over general website guidance, including anything you read here. The same label-led approach applies to bacteriostatic sodium chloride 0.9% (https://ausbacsupply.com/blog/what-is-bacteriostatic-sodium-chloride) (BAC saline). This article covers consumer checks; it does not provide preparation or administration instructions. ## Before opening Keep the vial in its original presentation and follow the temperature, light and other storage conditions printed on the exact product. Do not transfer the contents or apply a replacement label. Check the expiry and any storage warnings before use. ## Checks on receipt - Confirm the manufacturer, product name, volume and concentration match the order. - Check that the original label is readable and the closure is intact. - Check the printed lot and expiry information. - Contact us before use if the item is damaged, incorrect or materially different from the listing. Still comparing sellers? Our guide to where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia) covers what a transparent supplier should publish before you order. ## After opening Do not infer a storage period or handling method from the words “bacteriostatic” or “multi-dose” alone. Follow the exact beyond-use, storage and disposal directions on the vial and in the supplied product information. Clinical handling must be directed by a qualified healthcare professional. ## Common mistakes - **Assuming every brand has identical storage directions.** Check the exact presentation. - **Ignoring the printed expiry or an unreadable label.** Contact the seller before use. - **Treating a preservative as a sterility guarantee.** A bacteriostatic (https://ausbacsupply.com/glossary#bacteriostatic) agent inhibits bacterial growth; it does not replace labelled handling requirements. - **Treating preservative-free sterile water as multi-dose.** Follow its single-dose label. #### FAQ Q: How long does bacteriostatic water last after opening? A: Follow the beyond-use guidance on the vial label and in the manufacturer product information. Do not use a solution that is cloudy, discoloured or contains visible particles; ask a qualified healthcare professional if you are unsure. Q: Does bacteriostatic water need to be refrigerated? A: Follow the storage temperature printed on the exact vial and in its supplied product information. Do not assume all presentations have identical requirements. Q: Can bacteriostatic water expire? A: Yes. Check the printed expiry and beyond-use information for the exact presentation. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### Where to Buy Bacteriostatic Water (BAC Water) in Australia URL: https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia Published: 2026-06-16 · Updated: 2026-08-15 · Topic: Buying Guide Where to buy bacteriostatic water — BAC water — in Australia: what to look for in a supplier, why intact manufacturer presentations and local Melbourne dispatch matter, and how to avoid repackaged water. Key takeaways: - Use a supplier that identifies its legal operator and states where orders are dispatched. - Look for an intact original seal and label, with clear manufacturer product information. - Local dispatch provides clearer delivery expectations and Australian customer support. - Aus BAC Supply ships bacteriostatic water Australia-wide from Melbourne. Searching for **bacteriostatic water in Australia** (https://ausbacsupply.com/) — or **BAC water**, as most buyers type it — turns up a wide range of sellers. This guide covers the product and business information a transparent supplier should provide, why an intact manufacturer-labelled presentation matters, and the red flags that can indicate repackaged or poorly identified water. > **The short version:** buy an original manufacturer presentation from a supplier that publishes its legal operator and dispatch origin. Aus BAC Supply ships the BAC water 30 mL presentation (https://ausbacsupply.com/product/bacteriostatic-water-30ml) Australia-wide from Melbourne, with same-business-day dispatch before 2pm. ## The 4-point supplier checklist Before you buy bacteriostatic water from anyone, run them through these four points: - **Original manufacturer presentation** — an intact seal and label, supplied without repacking or decanting. - **Clear product identity** — manufacturer, composition, volume, lot and expiry details that can be checked on receipt. - **Accurate dispatch information** — clear origin, handling time, delivery estimates and shipping costs. - **A verifiable, contactable business** — legal operator, ABN or ACN, business location, phone, email and returns policy. > **The quick test:** if a seller does not identify the product, legal business operator, shipping terms and return process clearly, keep looking. ## Why presentation integrity matters An intact manufacturer-labelled presentation lets you inspect the product identity, composition, volume, lot, expiry and seal rather than relying on a reseller-applied label. We cover this fully in our guide to who makes BAC water (https://ausbacsupply.com/blog/who-makes-bac-water). ## Why local Australian dispatch matters Aus BAC Supply dispatches from **Melbourne, Australia** — Melbourne buyers get the shortest transit of all, covered on our bacteriostatic water Melbourne (https://ausbacsupply.com/bacteriostatic-water-melbourne) page. We publish our handling cutoff, shipping prices and estimated delivery windows, provide tracking and offer direct Australian email and phone support. Delivery estimates are not guarantees. If you have been searching locally instead, it is worth knowing that many community pharmacies do not routinely stock multi-dose bacteriostatic presentations — we cover what to ask and what your realistic options are in can you buy BAC water at a chemist in Australia (https://ausbacsupply.com/blog/bac-water-near-me-australia). ## Red flags to avoid - Stickers covering the original label, or vials with no clear labelling. - Prices, pack quantities or availability that change between the product page and checkout. - No business details and no way to make contact. - No stated dispatch origin, shipping cost or estimated delivery window. ## What to look for in the range A transparent range should identify each presentation clearly: - **Buy bacteriostatic water (BAC water) in Australia** (https://ausbacsupply.com/product/bacteriostatic-water-30ml) — bacteriostatic water, multi-dose, with 0.9% benzyl alcohol. - **Sterile water** (https://ausbacsupply.com/product/sterile-water) — preservative-free, single use. - **Bacteriostatic sodium chloride 0.9%** (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) — BAC saline, isotonic diluent. New to it? Read what bacteriostatic sodium chloride is (https://ausbacsupply.com/blog/what-is-bacteriostatic-sodium-chloride). If you are not sure which presentation is appropriate, read our comparison of bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water) and ask a qualified healthcare professional. These products are diluents, not ready-to-administer medicines; never inject by themselves or self-administer. #### FAQ Q: Where can I buy bacteriostatic water in Australia? A: Choose a supplier that identifies its legal operator and provides clear product, shipping and returns information. Aus BAC Supply dispatches manufacturer-labelled bacteriostatic water Australia-wide from Melbourne. Q: What should I look for in a supplier? A: Look for intact manufacturer labelling and seals, visible lot and expiry details, accurate dispatch information, verifiable business identity, direct contact details and a clear returns policy. Q: What is Bacteriostatic Water for Injection used for? A: It is labelled as a diluent or solvent for compatible medicines that require preparation before injection. It is not a ready-to-administer medicine and must never be injected by itself or self-administered. Sources: - Therapeutic Goods Administration — Australian Government Department of Health and Aged Care (https://www.tga.gov.au/) --- ### Bacteriostatic Saline (0.9% Sodium Chloride) vs Bacteriostatic Water: What's the Difference? URL: https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water Published: 2026-08-03 · Topic: Comparisons Bacteriostatic saline — bacteriostatic sodium chloride 0.9% — and bacteriostatic water are different preserved diluents. What each one is, how the labels differ, and what to check before buying in Australia. Key takeaways: - Bacteriostatic saline — bacteriostatic 0.9% sodium chloride — is isotonic salt solution with 0.9% benzyl alcohol as a preservative. - Bacteriostatic water is preserved water without sodium chloride; the two are different products with different labels. - Both are supplied as multi-dose diluents, not ready-to-administer medicines. - Which diluent is compatible with a given medicine is determined by that medicine's product information and a qualified healthcare professional. Shoppers searching for a preserved diluent in Australia run into two similar-sounding products: **bacteriostatic saline** — labelled as **bacteriostatic 0.9% sodium chloride** — and **bacteriostatic water**. They are related but not interchangeable, and the label on each vial is what defines them. This guide explains what each product is and what to check before buying. ## What bacteriostatic saline is **Bacteriostatic sodium chloride 0.9%** — often shortened to **bacteriostatic saline**, **BAC saline**, **BAC sodium chloride** or **preserved saline** — is an isotonic solution of 0.9% sodium chloride in water with 0.9% benzyl alcohol added as a bacteriostatic preservative. It is supplied in multi-dose vials and labelled as a diluent for compatible medicines, set out in the manufacturer product information. ## What bacteriostatic water is **Bacteriostatic water for injection** — **BAC water** — is sterile water with the same 0.9% benzyl alcohol preservative but *no sodium chloride*. It is also a multi-dose diluent. We cover it in detail in What is BAC water? (https://ausbacsupply.com/blog/what-is-bac-water) and in our guide to who makes BAC water (https://ausbacsupply.com/blog/who-makes-bac-water). ## The differences at a glance - **Composition** — saline contains 0.9% sodium chloride and is isotonic; bacteriostatic water contains no salt and is hypotonic on its own. - **Label** — each carries its own manufacturer product information, compatibility notes and warnings; one is not a substitute for the other. - **What they share** — both are preserved with 0.9% benzyl alcohol, supplied multi-dose, and are diluents rather than ready-to-administer medicines. > **The important part:** neither product may ever be injected by itself or self-administered. Which diluent — if either — is compatible with a particular medicine is defined by that medicine's product information and must be directed by a qualified healthcare professional. ## Which one do you need? That is not a question a retailer can answer for you. The medicine being prepared dictates the compatible diluent; check its supplied product information and ask a qualified healthcare professional. Our role is to supply factory-sealed, manufacturer-labelled presentations so what you receive is exactly what the label says. ## Buying either in Australia Aus BAC Supply dispatches both presentations from Melbourne in original manufacturer packaging: - **Bacteriostatic sodium chloride 0.9% (BAC saline)** (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) — preserved isotonic multi-dose diluent. - **Bacteriostatic water (BAC water)** (https://ausbacsupply.com/product/bacteriostatic-water-30ml) — preserved multi-dose diluent, no sodium chloride. Whichever you buy, apply the same supplier checks we outline in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia): intact seal, readable manufacturer label, visible lot and expiry, and a contactable Australian business. #### FAQ Q: What is bacteriostatic sodium chloride? A: Bacteriostatic sodium chloride 0.9% — BAC saline — is an isotonic solution of 0.9% sodium chloride with 0.9% benzyl alcohol added as a preservative. It is supplied in multi-dose vials and labelled as a diluent for compatible medicines, per the manufacturer product information. Q: Is bacteriostatic saline the same as bacteriostatic water? A: No. Bacteriostatic saline contains 0.9% sodium chloride and is isotonic; bacteriostatic water is preserved water with no salt. Each has its own label and compatibility notes, and one is not a substitute for the other. Q: What is preserved saline? A: Preserved saline is another name for bacteriostatic 0.9% sodium chloride — saline with a bacteriostatic preservative (0.9% benzyl alcohol) that allows the vial to be labelled multi-dose. Follow the exact vial label and product information. Q: Where can I buy bacteriostatic sodium chloride in Australia? A: Aus BAC Supply stocks manufacturer-sealed bacteriostatic sodium chloride 0.9% and dispatches Australia-wide from Melbourne. Check any supplier for intact original labelling, visible lot and expiry details, and verifiable business information. Q: Can bacteriostatic saline or bacteriostatic water be injected on their own? A: No. Both are diluents, not ready-to-administer medicines. Never inject either by itself or self-administer; preparation and use must follow the relevant product information under qualified healthcare-professional direction. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic 0.9% Sodium Chloride Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### Bacteriostatic Saline vs Preservative-Free Saline: What's the Difference? URL: https://ausbacsupply.com/blog/bacteriostatic-saline-vs-preservative-free-saline Published: 2026-08-15 · Topic: Comparisons Bacteriostatic saline and preservative-free saline are both 0.9% sodium chloride — the difference is the benzyl alcohol preservative, and everything that follows from it: multi-dose versus single-use labelling, in-use dating and the neonatal warning. Key takeaways: - Both are 0.9% sodium chloride; the difference is the preservative, not the salt. - Bacteriostatic saline adds 0.9% benzyl alcohol and is labelled multi-dose; preservative-free saline is labelled for a single use. - Manufacturer labelling warns against benzyl alcohol-preserved solutions for neonates — the preservative-free presentation exists for exactly those cases. - Which presentation a preparation requires is stated in the relevant product information, not chosen by preference. ## The short answer **Both are 0.9% sodium chloride. The difference is one ingredient: benzyl alcohol.** Bacteriostatic saline — also written BAC sodium chloride or BAC saline (https://ausbacsupply.com/shop/bacteriostatic-saline) — carries 0.9% benzyl alcohol as a bacteriostatic preservative and is labelled as a multi-dose vial. Preservative-free saline carries no antimicrobial agent of any kind, and its label allows a single use only. Everything else that separates the two follows from that one line on the label. This comparison is general product information. Selection for any clinical preparation belongs with the relevant medicine information and a qualified healthcare professional. ## Preservative-free saline, explained Preservative-free 0.9% sodium chloride — the "normal saline" of everyday clinical vocabulary — is an isotonic salt solution supplied sterile with no antimicrobial agent of any kind. Because nothing in the solution inhibits bacterial growth once the seal is broken, the labelling is strict: it is a single-use presentation, and any unused portion is discarded rather than kept. It is commonly supplied in small ampoules or single-dose vials for exactly that reason — the container is sized to be finished, not stored. ## Bacteriostatic saline, explained **Bacteriostatic sodium chloride 0.9%** is the same isotonic salt solution with **0.9% (9 mg/mL) benzyl alcohol** added. The preservative inhibits the growth of most common bacteria inside the vial after the stopper is first entered, which is what lets the manufacturer label it as a multi-dose presentation — one sealed vial, entered more than once across a finite in-use period. Our guide to what bacteriostatic sodium chloride is (https://ausbacsupply.com/blog/what-is-bacteriostatic-sodium-chloride) covers the naming and composition in full, and how the benzyl alcohol preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water) explains the mechanism. > **Bacteriostatic, not bactericidal:** the preservative holds bacterial growth in check; it does not sterilise a contaminated solution and does not replace the labelled handling requirements. An opened multi-dose vial still has a finite in-use period — 28 days is the figure commonly stated for benzyl-alcohol-preserved presentations, and any figure in the product information supplied with the exact vial governs — see expiry and in-use dating (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last). ## The differences at a glance | | Bacteriostatic Saline | Preservative-Free Saline | | --- | --- | --- | | Composition | 0.9% NaCl + 0.9% benzyl alcohol | 0.9% NaCl only | | Preservative | Benzyl alcohol (bacteriostatic) | None | | Vial labelling | Multi-dose — repeated entry across the in-use period | Single use — discard the remainder | | Typical presentation | 30 mL multi-dose vial | Small ampoules and single-dose vials | | Isotonic | Yes (0.9%) | Yes (0.9%) | | Neonatal use | Labelling warns against benzyl alcohol for neonates | The presentation specified where preservative exposure must be avoided | | Waste per withdrawal | Low — the vial keeps serving until its in-use period ends | One container per use, remainder discarded | | Selection | Stated by the relevant medicine information under qualified healthcare-professional direction | | ## The neonatal warning The most important line on a bacteriostatic label is the one that says who it is *not* for. Manufacturer product information warns against benzyl alcohol-preserved solutions for neonates, in whom the preservative has been associated with serious toxicity. This is precisely why the preservative-free presentation exists and why the two are not interchangeable in either direction: one is built to be re-entered, the other is built to expose the patient to nothing but salt and water. Where that warning applies is a matter for the product information and the treating professional, not for a retailer's website. ## Which presentation fits? - **Multi-dose preparation work** — where the relevant medicine information specifies a preserved diluent — is what the bacteriostatic presentation is labelled for. - **Single-use and preservative-sensitive applications** are what preservative-free saline is labelled for. - **Neither is a substitute for the other.** The specifying document is always the medicine's own product information. If the comparison you actually need is against bacteriostatic *water* rather than preservative-free saline, that is a different distinction — the solute, not the preservative — covered in bacteriostatic saline vs bacteriostatic water (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water). ## Buying bacteriostatic saline in Australia Preservative-free saline ampoules are a routine pharmacy line in Australia. The bacteriostatic presentation is the harder one to find: most chemists do not stock multi-dose preserved saline, which is why buyers end up searching online. We stock the original manufacturer's bacteriostatic sodium chloride 0.9% 30 mL multi-dose vial (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) — factory-sealed, with the lot and expiry intact — in our BAC sodium chloride range (https://ausbacsupply.com/shop/bacteriostatic-saline), dispatched from Melbourne with tracked Australia-wide delivery. Our supplier checklist (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia) applies to saline exactly as it does to BAC water: intact seal, original label, verifiable Australian business. #### FAQ Q: What is the difference between bacteriostatic saline and preservative-free saline? A: Both are 0.9% sodium chloride. Bacteriostatic saline adds 0.9% benzyl alcohol as a preservative and is labelled as a multi-dose vial; preservative-free saline has no preservative and is labelled for a single use, with the remainder discarded. Q: Is preservative-free saline the same as normal saline? A: In everyday use, yes — "normal saline" refers to preservative-free 0.9% sodium chloride, whatever the container. In the diluent context that means single-use ampoules and vials. Q: Can preservative-free saline be used more than once? A: No. With no preservative in the solution, the label allows a single use only. Re-entering a preservative-free container is contrary to its labelling. Q: How long does bacteriostatic saline last after opening? A: An opened multi-dose vial has a finite in-use period that is much shorter than the printed expiry — 28 days is the figure commonly stated for benzyl-alcohol-preserved presentations. Follow any period given in the product information supplied with your exact vial, and whichever ends first governs. Do not use a vial that is cloudy, discoloured or past either date. Q: Why can't neonates have bacteriostatic saline? A: Manufacturer labelling warns against benzyl alcohol-preserved solutions for neonates because the preservative has been associated with serious toxicity in newborns. The preservative-free presentation exists for those cases. Clinical applicability is always a matter for the product information and a qualified healthcare professional. Q: Where can I buy bacteriostatic saline in Australia? A: Most Australian chemists do not stock multi-dose bacteriostatic saline. Aus BAC Supply stocks the original manufacturer's factory-sealed bacteriostatic sodium chloride 0.9% 30 mL presentation, dispatched Australia-wide from Melbourne. Sources: - Bacteriostatic 0.9% Sodium Chloride Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### What Is BAC Water? Bacteriostatic Water Explained Simply URL: https://ausbacsupply.com/blog/what-is-bac-water Published: 2026-08-03 · Topic: Basics What BAC water is, what bacteriostatic means, what's in the vial (sterile water with 0.9% benzyl alcohol), how it differs from sterile water and saline, and what to check when buying in Australia. Key takeaways: - BAC water is the common short name for bacteriostatic water for injection (BWFI). - It is sterile water with 0.9% benzyl alcohol added, which is why the vial can be labelled multi-dose. - “Bacteriostatic” means the preservative inhibits bacterial growth inside the vial — it is not a sterility guarantee. - BAC water is a diluent, never injected by itself; use is governed by the manufacturer product information and professional direction. **BAC water** is the everyday short name for **bacteriostatic water for injection** (sometimes abbreviated BWFI). You will see the same product written as bac water, bacterio water or bacteriostatic water — all describing one thing: sterile water with a small amount of preservative, supplied in a multi-dose vial and labelled as a diluent. ## The name, decoded - **“BAC”** is simply short for *bacteriostatic* — it has nothing to do with blood alcohol readings that share the acronym. - **“Water for injection”** is the pharmaceutical-grade water base described in the manufacturer product information. ## What “bacteriostatic” means **Bacteriostatic** describes an agent that *inhibits the growth* of bacteria rather than necessarily killing them (which would be “bactericidal”). In BAC water that role is played by **0.9% benzyl alcohol**. The preservative is why the manufacturer can label the vial multi-dose — and it is a growth inhibitor inside a sealed, properly handled vial, not a sterility guarantee. We look at the chemistry in our benzyl alcohol guide (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water). ## What's in the vial Two ingredients: sterile water for injection and 0.9% benzyl alcohol. The presentation stocked in Australia by Aus BAC Supply is the 30 mL multi-dose vial (https://ausbacsupply.com/product/bacteriostatic-water-30ml), supplied factory-sealed with the original manufacturer label, lot and expiry visible. ## What BAC water is not - **Not sterile water.** Plain sterile water has no preservative and is single-use — see bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water). - **Not saline.** Bacteriostatic 0.9% sodium chloride is a different, salt-containing diluent — see bacteriostatic saline vs bacteriostatic water (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water). - **Not a medicine on its own.** It is a diluent or solvent for compatible medicines and must never be injected by itself or self-administered. Compatibility and preparation belong with the relevant product information and a qualified healthcare professional. ## Buying it in Australia Buy an original manufacturer presentation from a supplier that identifies its legal operator, dispatch origin and returns process — the full checklist is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia). Aus BAC Supply dispatches Australia-wide from Melbourne. #### FAQ Q: What is BAC water? A: BAC water is the short name for bacteriostatic water for injection: sterile water with 0.9% benzyl alcohol added as a preservative, supplied in a multi-dose vial and labelled as a diluent for compatible medicines. It is never injected by itself. Q: What does bacteriostatic mean? A: Bacteriostatic means inhibiting the growth of bacteria, as distinct from bactericidal (killing bacteria). In BAC water, 0.9% benzyl alcohol provides the bacteriostatic effect inside the sealed vial. It is not a sterility guarantee. Q: Is BAC water the same as bacteriostatic water for injection? A: Yes. BAC water, bac water and BWFI are all common names for bacteriostatic water for injection — the same manufacturer-labelled product. Q: What is BAC water used for? A: Its labelled application is as a diluent or solvent for compatible medicines that require preparation, as set out in the manufacturer product information. Compatibility and preparation must be directed by a qualified healthcare professional. Q: Is BAC water the same as sterile water? A: No. Sterile water for injection contains no preservative and its label treats it as single-use. BAC water contains 0.9% benzyl alcohol, which is why its vial can be labelled multi-dose. The two carry different labels and are not interchangeable. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### BAC Water Near Me: Can You Buy It at a Chemist in Australia? URL: https://ausbacsupply.com/blog/bac-water-near-me-australia Published: 2026-08-03 · Updated: 2026-08-15 · Topic: Buying Guide Looking for BAC water near you in Australia? Whether chemists stock bacteriostatic water, what to ask, and why most buyers use a specialist supplier with fast Melbourne dispatch and tracked Australia-wide shipping. Key takeaways: - Many local chemists don't routinely stock multi-dose bacteriostatic water presentations — call ahead before visiting. - “Near me” in practice usually means a specialist online supplier with fast domestic dispatch. - Aus BAC Supply dispatches manufacturer-sealed BAC water from Melbourne, Australia-wide, with same-business-day handling before 2pm. - Whoever you buy from, check the seal, label, lot, expiry and the seller's business details. If you have searched **“BAC water near me”** or rung around local pharmacies, you have probably discovered the awkward truth: **bacteriostatic water** is a niche product that many Australian community chemists simply don't keep on the shelf. Here is what your options actually look like. ## Do chemists stock it? Availability varies pharmacy to pharmacy. Multi-dose bacteriostatic presentations are not an everyday retail line, so many chemists don't routinely carry them and may need to check with their wholesaler. If you want to try locally, call ahead and ask specifically for *bacteriostatic water for injection in the manufacturer's multi-dose vial*, and confirm the manufacturer, volume and expiry before making the trip. ## Your realistic options - **A local pharmacy** — possible, but stock is inconsistent and often needs ordering in. - **A specialist online supplier** — the route most buyers take: consistent stock of the exact manufacturer presentation, shipped tracked to your door. ## Why online usually wins A specialist supplier can show you the exact presentation before you pay — manufacturer, volume, composition and packaging — and ship it fast. Aus BAC Supply stocks the 30 mL BAC water presentation (https://ausbacsupply.com/product/bacteriostatic-water-30ml) factory-sealed, dispatches from **Melbourne** with same-business-day handling on orders before 2pm, and ships tracked Australia-wide, with express options. In most metro areas that means the practical answer to “near me” is “at your door within days”. ## Melbourne and metro buyers Orders dispatch from Melbourne, so Victorian metro deliveries are typically at the fast end of the estimates shown at checkout — the details are on our bacteriostatic water Melbourne (https://ausbacsupply.com/bacteriostatic-water-melbourne) page. Sydney, Brisbane, Adelaide, Perth and regional addresses are all served by the same tracked services. Delivery estimates are not guarantees. ## Checks that matter anywhere Chemist counter or courier satchel, the same rules apply: intact original seal and manufacturer label, readable lot and expiry, a clearly identified business with contact details and a returns process. The full checklist is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia), and how to read a vial label (https://ausbacsupply.com/blog/how-to-read-a-bacteriostatic-water-vial-label) covers what the printing itself should say. These products are diluents, not ready-to-administer medicines — never inject them by themselves; use must follow the manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: Can you buy BAC water from a chemist in Australia? A: Sometimes — availability varies by pharmacy and many community chemists don't routinely stock multi-dose bacteriostatic water, so call ahead and ask. Many buyers instead use a specialist supplier that ships the sealed manufacturer presentation Australia-wide. Q: Where can I get BAC water near me? A: If a local pharmacy can't help, a specialist online supplier is the practical option. Aus BAC Supply dispatches manufacturer-sealed BAC water from Melbourne with tracked Australia-wide delivery and express options. Q: Can I buy BAC water in Melbourne? A: Yes — Aus BAC Supply dispatches from Melbourne, so Victorian metro orders are typically at the fast end of the delivery estimates shown at checkout. All orders ship tracked. Q: How fast is delivery? A: Orders placed before 2pm on a business day are dispatched the same business day from Melbourne, with standard and express tracked options at checkout. Delivery estimates are shown before payment and are not guarantees. Q: What should I check when buying BAC water? A: An intact original manufacturer seal and label, visible lot and expiry details, a clearly identified legal operator with contact details, stated dispatch origin and a returns process — whether buying from a pharmacy or online. Sources: - Therapeutic Goods Administration — Australian Government Department of Health and Aged Care (https://www.tga.gov.au/) --- ### Who Makes BAC Water? The Manufacturer and the Vial Explained URL: https://ausbacsupply.com/blog/who-makes-bac-water Published: 2026-08-03 · Updated: 2026-08-15 · Topic: Basics Who makes the BAC water stocked in Australia, what its controlled USP specification covers, why a diluent specification says nothing about anything dissolved in it, and what to check when buying an original presentation. Key takeaways: - The BAC water stocked in Australia is made by Hospira, a Pfizer company — a manufacturer name on the vial, not a different kind of product. - The presentation stocked in Australia is a 30 mL multi-dose glass vial: sterile water with 0.9% benzyl alcohol. - Bacteriostatic Water for Injection is made to a compendial specification that includes a defined pH range. - The USP monograph is a specification for the diluent itself — it says nothing about how anything dissolved in it will behave. - Products supplied by Aus BAC Supply are not for human or veterinary therapeutic use and must never be injected, ingested or self-administered. **BAC water** is a product, not a brand — the name on the vial identifies its *manufacturer*, not a special category of water. This guide explains who makes the presentation stocked in Australia, exactly what is in the vial, what the manufacturing specification covers, and how to tell a genuine unaltered presentation from a repackaged one. ## Who makes BAC water Hospira is a long-established manufacturer of injectable products and infusion solutions, and is **a Pfizer company**. So **Hospira bacteriostatic water** simply means bacteriostatic water for injection produced under the Hospira label. Aus BAC Supply is an independent retailer and is not affiliated with, or endorsed by, Hospira or Pfizer — we supply their presentation exactly as it leaves the manufacturer. ## What the vial contains The presentation we stock in Australia is a **30 mL multi-dose glass vial** containing two things: - **Sterile Water for Injection** — the pharmaceutical-grade water base. - **0.9% benzyl alcohol** (9 mg/mL) — the bacteriostatic preservative that allows the manufacturer to label the vial multi-dose. | Detail | Bacteriostatic Water for Injection | | --- | --- | | Volume | 30 mL multi-dose vial | | Composition | Sterile water + 0.9% (9 mg/mL) benzyl alcohol | | Closure | Rubber stopper, crimped aluminium collar and flip-off cap | | Labelling | Original printed manufacturer label | | Identifiers | Lot number and expiry date printed on the vial | That is the whole formulation. If you want the plain-English version of what “bacteriostatic” means, start with what is BAC water (https://ausbacsupply.com/blog/what-is-bac-water); the preservative chemistry is covered in our benzyl alcohol guide (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water). ## The compendial specification (and pH) Bacteriostatic Water for Injection is a **compendial product** — it is manufactured and released against the published **USP monograph** rather than to each manufacturer's own private recipe. That specification covers identity, sterility, preservative content, particulate limits, container closure integrity and a **controlled pH range**, among other attributes. This is what “USP grade” refers to: the product meets the United States Pharmacopeia standard for Bacteriostatic Water for Injection. **This presentation is produced under pharmaceutical GMP, to a controlled USP specification that includes pH.** pH is a tested release parameter, not an incidental property of the batch: the product is made, tested and released within the specified range, and the manufacturer's product information is the authority on the figures for the exact presentation you hold. That controlled, documented manufacturing is the substantive difference between an original manufacturer presentation and water of unclear origin that has been decanted or relabelled by a reseller. Two things that specification does *not* tell you, and it is worth being precise about both: - **“Same monograph” does not mean “interchangeable in every context.”** Presentations differ in volume, closure, excipient content and labelled applications, and each carries its own product information. Read the label on the vial in front of you rather than generalising from another product. - **A diluent's specification says nothing about another substance's behaviour.** How any medicine behaves when prepared is governed by that medicine's own formulation and product information. If a preparation does not look as its product information describes, do not use it — set it aside and speak to a qualified healthcare professional. ## Peptides, clarity and what a specification covers > **Use restriction:** Products supplied by Aus BAC Supply are for non-therapeutic purposes only. **Not for human or veterinary therapeutic use.** Never inject, ingest or self-administer. This article does not provide therapeutic reconstitution or administration instructions. **What an original manufacturer presentation offers is documentation.** The diluent is supplied sterile and nonpyrogenic, is manufactured to a controlled pharmaceutical specification and is expected to be clear and colourless in the vial — attributes recorded against a lot number and checkable on the label in front of you. Water that has been decanted, relabelled or made without a documented specification carries none of that. What the specification does not describe is anything dissolved in it: whether this or any diluent is compatible with a particular preparation is stated in that preparation's own product information, under qualified healthcare-professional direction. The buying side — what the multi-dose label offers and the checks that matter — is covered in bacteriostatic water for peptides in Australia (https://ausbacsupply.com/blog/bacteriostatic-water-for-peptides-australia). No diluent brand can guarantee that every reconstituted material will remain clear. Cloudiness, haze, particles or discolouration can arise from the material itself, incompatibility, contamination, storage or preparation technique—not simply the brand of water. We go through those categories, and why none of them can be told apart by eye, in what cloudiness after reconstitution actually tells you (https://ausbacsupply.com/blog/cloudy-after-reconstitution). Pfizer's manufacturer information for Hospira Bacteriostatic Water for Injection says to inspect reconstituted material for clarity, unexpected precipitation and discolouration (https://www.pfizermedicalinformation.com/bacteriostatic-water/warnings). If material expected to be clear appears cloudy, hazy, discoloured or contains particles, do not use it. ## Diluent choice is a label question Whether bacteriostatic water, preservative-free sterile water (https://ausbacsupply.com/product/sterile-water) or bacteriostatic sodium chloride (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water) is the appropriate diluent for a given medicine is determined by **that medicine's approved product information** — which specifies the compatible diluent, the volume and the handling requirements. It is not determined by the diluent's manufacturer, and it is not something a retailer can advise on. **Products supplied by Aus BAC Supply are for non-therapeutic purposes only. Not for human or veterinary therapeutic use.** Never inject, ingest or self-administer. ## Identifying a genuine presentation When buying bacteriostatic water in Australia, check both the vial and the supplier. A transparent seller should identify the manufacturer and dispatch origin, publish its legal business and contact details, and provide clear shipping and returns information. - **Original printed labelling** identifying the manufacturer, the product name, volume and composition — not a reseller sticker over another label. - **An intact flip-off cap** sitting flush over an undamaged crimped aluminium collar. - **Readable lot and expiry** details you can check on arrival. - **A supplier that publishes its legal operator**, dispatch origin, contact details and returns process — the full checklist is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia). Aus BAC Supply supplies every product factory-sealed in its original manufacturer presentation — never repackaged, decanted or relabelled by us — and dispatches Australia-wide from Melbourne with tracking. #### FAQ Q: Who makes the BAC water stocked in Australia? A: It is bacteriostatic water for injection manufactured by Hospira, a Pfizer company. The presentation stocked in Australia is a 30 mL multi-dose glass vial containing sterile water with 0.9% benzyl alcohol as a preservative, labelled as a diluent for compatible medicines. Q: What is the pH of bacteriostatic water? A: Bacteriostatic Water for Injection is a compendial product released within a controlled pH range defined by the USP monograph. The manufacturer produces it under pharmaceutical GMP to that controlled USP specification, so pH is a tested release parameter rather than an incidental property. Refer to the manufacturer product information supplied with the exact presentation you hold for its specified figures — that document is the authority, not a general web page. Q: Is this BAC water manufactured to a controlled pH specification? A: Yes. It is produced under pharmaceutical GMP and released against a compendial specification that includes a defined pH range, alongside identity, sterility, preservative content and container closure requirements. That documented, tested manufacturing is what distinguishes an original manufacturer presentation from water of unclear origin that has been decanted or relabelled. Q: Is this BAC water different from other bacteriostatic water? A: It is made against the same compendial monograph as other compliant Bacteriostatic Water for Injection products, so the core specification is common. Presentations still differ in volume, closure and labelled applications, so always read the product information for the exact vial you have. Q: Can a diluent's specification guarantee that reconstituted material stays clear? A: No. Bacteriostatic Water for Injection is a clear, sterile, nonpyrogenic diluent released against a controlled pharmaceutical specification, and that specification describes the diluent only. How any other material behaves once dissolved is governed by its own formulation, product information, storage and handling. If material expected to be clear appears cloudy, hazy, discoloured or contains particles, do not use it. Products supplied by Aus BAC Supply are not for human or veterinary therapeutic use and must never be injected, ingested or self-administered. Q: Can I buy the original manufacturer presentation in Australia? A: Aus BAC Supply stocks the original Hospira presentation and dispatches Australia-wide from Melbourne. We are an independent retailer and are not affiliated with or endorsed by Hospira or Pfizer. Q: What should I check when choosing a supplier? A: Look for an intact flip-off cap and crimp, clean original manufacturer labelling, visible lot and expiry details, a stated dispatch origin, verifiable business information and clear shipping and returns policies. Q: What size does this BAC water come in? A: The presentation Aus BAC Supply stocks is the 30 mL multi-dose glass vial, supplied factory-sealed in its original manufacturer packaging. Q: Can BAC water be injected or used therapeutically? A: No. Products supplied by Aus BAC Supply are for non-therapeutic purposes only. Not for human or veterinary therapeutic use. Never inject, ingest or self-administer. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### How Long Does Bacteriostatic Water Last? Expiry and In-Use Dating URL: https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last Published: 2026-08-07 · Updated: 2026-08-15 · Topic: Handling Bacteriostatic water carries two dates — the printed expiry on the sealed vial and a shorter in-use period once the stopper is first entered. How each one works, why the preservative doesn't extend either indefinitely, and what to do at the end of the period. Key takeaways: - Two different dates apply: the manufacturer's printed expiry for the sealed vial, and a shorter in-use period that starts the moment the stopper is first entered. - The preservative slows bacterial growth after entry — it does not make an opened vial keep indefinitely. - The in-use period printed in the supplied product information is the figure that governs; 28 days is the commonly stated period for benzyl-alcohol-preserved multi-dose presentations. - The date of first entry is recorded on the vial, and the earlier of the two dates ends its usable life. “How long does bacteriostatic water last?” has two answers, and confusing them is the most common handling mistake with a multi-dose vial. A sealed vial and an opened one are governed by different dates entirely. ## Two dates, not one Every vial carries a printed **expiry date** set by the manufacturer, which applies to the product in its unopened, factory-sealed state. Separately, once the stopper has been entered for the first time, a much shorter **in-use period** begins. Whichever of the two arrives first is the one that ends the vial's usable life. ## The sealed vial's expiry The printed expiry reflects stability testing on the sealed presentation stored as labelled — for Bacteriostatic Water for Injection (https://ausbacsupply.com/product/bacteriostatic-water-30ml), that means controlled room temperature in the original vial, away from direct light and out of freezing conditions. Sealed vials are typically dated well over a year out from manufacture, but the only date that matters is the one printed on the vial in your hand. Do not use a vial past it, and do not attempt to judge a product by appearance in place of the printed date. ## The in-use period The moment a needle passes through the stopper, the vial stops being a sealed system. The benzyl alcohol is what allows it to be entered more than once at all — as covered in how the 0.9% preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water), it inhibits the growth of most common bacteria rather than sterilising anything. That protection is finite, and the supplied manufacturer product information states the in-use period accordingly. **28 days from first entry** is the period commonly stated for benzyl-alcohol-preserved multi-dose presentations, but the figure printed in the product information supplied with your exact vial is the authority — not a general web page, and not a longer period someone quotes from a different product. ## Why the preservative isn't a licence A preservative at a bacteriostatic concentration holds growth in check; it does not kill everything introduced, and it does nothing at all about the number of times a stopper has been pierced, whether the surface was wiped before each entry, or particulate shed into the solution. This is why the in-use period is short and fixed rather than something to be judged vial by vial. A solution that still looks clear is not evidence that its in-use period has not elapsed — and equally, anything cloudy, discoloured or containing visible particles (https://ausbacsupply.com/blog/cloudy-bacteriostatic-water) is not to be used regardless of the date. ## In practice - **The date of first entry is recorded** on the vial or its carton. Nobody remembers it accurately a fortnight later. - **The period is not an entry count.** No maximum number of withdrawals is printed anywhere — how many times you can use a multi-dose vial (https://ausbacsupply.com/blog/how-many-times-can-you-use-a-multi-dose-vial) covers why. - **Store as labelled** between entries — see how to store bacteriostatic water (https://ausbacsupply.com/blog/how-to-store-bacteriostatic-water) for the detail. - **Discard on the earlier date.** If the printed expiry falls inside the in-use period, the expiry wins. - **Buy the size you'll actually use.** A larger presentation is not better value if the in-use period ends with most of it unused — multi-vial packs of a smaller presentation often work out better than one large vial. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Storage, in-use limits, handling and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: How long does bacteriostatic water last once opened? A: A shorter in-use period applies from the moment the stopper is first entered — 28 days is the period commonly stated for benzyl-alcohol-preserved multi-dose presentations. The figure printed in the product information supplied with your exact vial is the one that governs. Q: How long does an unopened vial last? A: Until the expiry date printed on the vial by the manufacturer, provided it has been stored as labelled. That date applies to the sealed presentation only; once entered, the shorter in-use period takes over. Q: Does the preservative mean an opened vial keeps indefinitely? A: No. Benzyl alcohol inhibits the growth of most common bacteria — it does not sterilise the vial or reverse contamination. That is why a fixed in-use period applies rather than a judgement call. Q: Can I use bacteriostatic water past its expiry date? A: No. Do not use a vial past the printed expiry, and do not judge a product by appearance in place of the date. Q: Which date applies if both are close? A: Whichever falls first. If the printed expiry arrives during the in-use period, the expiry ends the vial's usable life. Q: How should an opened vial be stored between entries? A: As specified on the label and in the supplied product information — generally controlled room temperature in the original vial, away from direct light. Storage conditions do not extend the in-use period. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### Sterile Water vs Distilled Water: What's Actually Different? URL: https://ausbacsupply.com/blog/sterile-water-vs-distilled-water Published: 2026-08-07 · Topic: Comparisons Distilled describes a purification method; sterile describes the absence of viable microorganisms. Why the two words answer different questions, why distilled water is not an injectable presentation, and where bacteriostatic water fits. Key takeaways: - Distilled describes how water was purified. Sterile describes whether viable microorganisms are present. They are not the same claim. - Water can be distilled and not sterile, or sterile and not distilled — the two properties are independent. - Sterile Water for Injection is manufactured, filled and released as an injectable presentation; distilled water sold for household or laboratory use is not. - Neither is interchangeable with bacteriostatic water, which adds a preservative so a vial can be entered more than once. The two words get used as though they were grades of the same thing, with distilled somewhere below sterile on a single scale. They are not on one scale at all. **Distilled** answers how the water was purified; **sterile** answers whether viable microorganisms are present. Either can be true without the other. ## Two different questions Water can be distilled and not sterile — distillation removes dissolved solids and many contaminants, but the moment distilled water is collected into a non-sterile container and left open, nothing prevents microbial growth. Water can equally be sterile without ever having been distilled, since other purification routes are used and sterility comes from the filtration, filling and sealing steps rather than from distillation itself. ## What distilled means Distillation boils water and condenses the vapour, leaving behind dissolved minerals and many non-volatile contaminants. It is a purification method with a long history and real uses — but it is a description of process, not a statement about the finished product's microbiological state, its container, or what it has been released for. ## What sterile means Sterile Water for Injection is purified water that has been filtered to remove microorganisms and sealed under sterile conditions, with no preservative added. Because there is no preservative holding growth in check once the seal is broken, its vial is labelled for a single withdrawal and should not be re-entered — the point covered in full in bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water). ## Why the presentation matters The practical difference is not really chemistry, it is the whole manufacturing and release chain behind the container. An injectable presentation is produced under pharmaceutical GMP, filled into a container-closure system tested for that purpose, and released against a compendial specification covering identity, sterility, particulate limits and container integrity — with a lot number and expiry that trace back to that release. Distilled water sold for household appliances or general laboratory use carries none of that, whatever its purity on a conductivity meter. The two are not substitutes, and the fact that one is cheaper reflects what has not been done to it. ## Where bacteriostatic water fits Bacteriostatic water (https://ausbacsupply.com/shop/bacteriostatic-water) is sterile water with 0.9% benzyl alcohol added as a bacteriostatic preservative. That single addition is what allows a sealed multi-dose vial to be entered more than once rather than discarded after a single withdrawal. It does not make the water purer than sterile water — it changes how long the vial stays usable after opening. Which of the two a given product calls for is specified in that product's own manufacturer information, not chosen on preference. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Use must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: Is distilled water sterile? A: Not necessarily. Distillation is a purification method; sterility depends on how the water was filtered, filled and sealed, and on whether the container has been opened. Distilled water in a non-sterile container is not sterile. Q: Is sterile water distilled? A: It may or may not be. Sterility comes from the filtration, filling and sealing process, not from distillation, so a sterile presentation is not required to have been distilled. Q: Can distilled water be used in place of sterile water for injection? A: No. Sterile Water for Injection is manufactured, filled and released as an injectable presentation with a traceable lot and expiry. Distilled water sold for household or general laboratory use carries none of that and is not a substitute. Q: What is the difference between sterile water and bacteriostatic water? A: Bacteriostatic water is sterile water with 0.9% benzyl alcohol added as a preservative, which allows a sealed multi-dose vial to be entered repeatedly. Sterile water has no preservative and its vial is labelled for a single withdrawal. Q: Which one should I choose? A: The supplied manufacturer product information for the product being prepared specifies its diluent. That specification decides it. Sources: - United States Pharmacopeia — National Formulary (USP–NF) — United States Pharmacopeial Convention --- ### BAC Water Vial Sizes and Pack Quantities: Which to Buy URL: https://ausbacsupply.com/blog/bac-water-vial-sizes-and-pack-quantities Published: 2026-08-07 · Topic: Buying Guide How to choose between a single 30 mL vial, a multi-vial pack and a manufacturer tray — why the in-use period matters more than the price per millilitre, and how shipping thresholds change the real total. Key takeaways: - Pack quantity and vial volume are different choices — more vials is not the same as a bigger vial. - The in-use period after first entry, not the price per millilitre, is usually what should decide the volume. - Multi-vial packs and manufacturer trays lower the unit price without extending how long any single opened vial lasts. - Free standard shipping over $150 often makes a pack cheaper in total than two separate single-vial orders. Buying bacteriostatic water involves two decisions that are easy to run together: how large each vial is, and how many vials arrive in the box. They pull in different directions, and only one of them is really about price. ## Two separate choices **Vial volume** is how much solution one sealed container holds — the presentation we stock is the 30 mL multi-dose vial. **Pack quantity** is how many of those identical sealed vials you receive: singly, in 2- (https://ausbacsupply.com/product/bacteriostatic-water-30ml?size=2%20vials) and 3-vial packs (https://ausbacsupply.com/product/bacteriostatic-water-30ml?size=3%20vials), or in manufacturer trays of 25 and 50. A 3-vial pack is not a bigger vial; it is three of the same vial, each with its own seal and its own in-use clock that does not start until that particular vial is entered. ## Choosing the vial volume The instinct is to compare price per millilitre and take the largest vial. That reasoning breaks down because of the in-use period: once a vial is entered, a fixed and fairly short window applies regardless of how much is left in it — see how long bacteriostatic water lasts (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last). A large vial that gets discarded two-thirds full is more expensive per millilitre actually used than a smaller one that gets finished, whatever the shelf price suggested. ## Choosing the pack quantity Pack quantity carries none of that risk, which is what makes it the straightforward lever. Unopened vials keep until their printed expiry, so buying several at once brings the unit price down without shortening anything — each vial simply waits, sealed, until it is the one you open. The sensible ceiling is the printed expiry: buy what you will realistically get through before then. Trays of 25 and 50 exist for genuinely higher-volume requirements rather than as a default. ## What it actually costs Shipping changes the arithmetic more than most buyers expect. Standard shipping is $9.99 and express $14.99, but **standard is free on orders over $150**, where express drops to $5. Two separate single-vial orders can therefore cost more in total than one pack that clears the threshold — and arrive slower. Orders placed before 2:00 pm Melbourne time on a business day are dispatched the same business day, with tracked delivery Australia-wide. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Use must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What sizes does BAC water come in? A: Aus BAC Supply stocks the original manufacturer's 30 mL multi-dose presentation, available as a single vial, in 2- and 3-vial packs, and in manufacturer trays of 25 and 50. Every option is the same sealed vial — the pack size is how many you receive. Q: Is a bigger vial better value? A: Not necessarily. A fixed in-use period applies once a vial is entered, regardless of how much remains in it, so a large vial discarded part-used can cost more per millilitre actually used than a smaller one that gets finished. Q: Does buying a multi-vial pack shorten anything? A: No. Unopened vials keep until their printed expiry, and each vial's in-use period only starts when that particular vial is first entered. Buying several at once lowers the unit price without any trade-off beyond the expiry date. Q: How many vials should I buy? A: As many as you will realistically use before the printed expiry. Beyond that point the saving disappears into vials that are discarded unopened. Q: When is shipping free? A: Standard shipping is free on orders over $150, and express is $5 on those orders. Below the threshold, standard is $9.99 and express $14.99, tracked Australia-wide. --- ### What Is Bacteriostatic Sodium Chloride 0.9%? URL: https://ausbacsupply.com/blog/what-is-bacteriostatic-sodium-chloride Published: 2026-08-07 · Topic: Basics Bacteriostatic sodium chloride explained: what the 0.9% refers to, what benzyl alcohol does, how it differs from plain saline and from bacteriostatic water, and how the Australian presentation is supplied. Key takeaways: - Bacteriostatic sodium chloride, bacteriostatic saline and BAC saline are three names for the same product. - It is isotonic 0.9% sodium chloride with benzyl alcohol added as a bacteriostatic preservative. - The preservative is what allows a sealed multi-dose vial to be entered more than once — it is the same agent used in bacteriostatic water. - Plain 0.9% sodium chloride for injection has no preservative and its vial is labelled for a single withdrawal. **Bacteriostatic sodium chloride** is isotonic 0.9% sodium chloride solution with benzyl alcohol added as a bacteriostatic preservative, supplied in a sealed multi-dose vial. If that sentence contains three terms you were not sure about, this guide takes them one at a time. ## Three names, one product The naming causes more confusion than the chemistry does. **Bacteriostatic sodium chloride**, **bacteriostatic saline** and **BAC saline** all describe the same thing. Sodium chloride is the salt; a solution of it in water is what "saline" means; and BAC is simply the common abbreviation of bacteriostatic. Product labelling generally uses the sodium chloride form, which is why the formal name and the term people search rarely match. ## What the 0.9% means 0.9% is the concentration of sodium chloride in the solution — 9 mg per mL. That figure is not arbitrary: at 0.9% the solution is **isotonic**, meaning its effective osmotic concentration matches that of the reference solution. This is why 0.9% sodium chloride is the standard example whenever isotonic saline is described, and why the percentage is part of the product's name rather than a footnote. ## What the preservative does Benzyl alcohol is the bacteriostatic agent. "Bacteriostatic" means it inhibits the growth of most common bacteria rather than necessarily killing them — a distinction covered in full in how the 0.9% benzyl alcohol preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water). The practical consequence is the whole point of the product: because growth is held in check after the seal is broken, the vial can be entered more than once instead of being discarded after a single withdrawal. That protection is finite, so a fixed in-use period still applies from first entry — see how long a vial lasts once opened (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last). ## Versus plain saline This is the comparison most often got wrong. Plain **0.9% Sodium Chloride Injection USP** — the ordinary saline vial — contains no preservative at all. Its salt concentration is identical, its appearance is identical, and its vial is labelled for a *single* withdrawal precisely because there is nothing inhibiting growth once it has been entered. The bacteriostatic version is not stronger, purer or more concentrated saline. The only difference is the preservative, and the only thing the preservative changes is how many times the vial can be accessed. ## Versus bacteriostatic water Both are preserved with benzyl alcohol and both come as multi-dose vials, so the preservative is not the difference here — the solute is. Bacteriostatic water (https://ausbacsupply.com/shop/bacteriostatic-water) contains no solute at all; bacteriostatic saline is isotonic 0.9% sodium chloride. Which of the two a given product requires is stated in that product's own manufacturer information, and that specification decides it. It is not a preference, and the two are not interchangeable on the basis that both are clear liquids in similar vials. The longer comparison is in bacteriostatic saline vs bacteriostatic water (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water). ## The Australian presentation The presentation Aus BAC Supply stocks is the original manufacturer's bacteriostatic 0.9% sodium chloride 30 mL multi-dose vial (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) — a plastic flip-top vial, sterile and non-pyrogenic, released against the USP monograph, supplied factory-sealed and unaltered. It is available singly and in 2- and 3-vial packs, dispatched from Melbourne with tracked delivery Australia-wide. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Compatibility, preparation, storage and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What is bacteriostatic sodium chloride? A: Isotonic 0.9% sodium chloride solution with benzyl alcohol added as a bacteriostatic preservative, supplied in a sealed multi-dose vial. The preservative inhibits the growth of most common bacteria, which is what allows the vial to be entered more than once. Q: Is bacteriostatic sodium chloride the same as bacteriostatic saline? A: Yes. Sodium chloride is the salt that makes a solution saline, so the two names describe the same product. You will also see it shortened to BAC saline. Q: What does the 0.9% refer to? A: The concentration of sodium chloride in the solution — 9 mg per mL. At that concentration the solution is isotonic, which is why 0.9% is the standard figure for isotonic saline. Q: How is it different from normal saline? A: Plain 0.9% Sodium Chloride Injection has the same salt concentration but no preservative, so its vial is labelled for a single withdrawal. The bacteriostatic version adds benzyl alcohol, which is what makes a multi-dose vial possible. Q: Is it the same as bacteriostatic water? A: No. Both are preserved with benzyl alcohol, but bacteriostatic water contains no solute while bacteriostatic saline is isotonic 0.9% sodium chloride. The manufacturer information for the product being prepared specifies which one it requires. Q: Can you buy bacteriostatic sodium chloride in Australia? A: Yes. Aus BAC Supply stocks the original manufacturer's 30 mL multi-dose presentation and dispatches from Melbourne with tracked delivery Australia-wide. Sources: - Bacteriostatic 0.9% Sodium Chloride Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### Cloudy After Reconstitution: What Cloudiness Actually Tells You URL: https://ausbacsupply.com/blog/cloudy-after-reconstitution Published: 2026-08-11 · Updated: 2026-08-15 · Topic: Troubleshooting Why a solution can turn cloudy, hazy or milky after a diluent is added — what light scattering indicates, how to tell persistent haze from transient bubbles, and why the inspection outcome is the same in every case. Key takeaways: - Cloudiness is light being scattered by something that is not dissolved — undissolved solid, precipitate, aggregated material or contamination. - Transient bubbles and foam are not cloudiness; they rise and clear on standing, whereas haze persists. - “Cloudy” is not automatically wrong — the product's own information defines the appearance expected of it, and some presentations are expected to be opalescent. - Where material is expected to be clear and is not, the inspection outcome is the same in every case: do not use it. - Products supplied by Aus BAC Supply are for non-therapeutic purposes only and must never be injected, ingested or self-administered. A solution that was expected to come out clear and instead looks **cloudy, hazy or milky** is one of the most common things people ask about after adding a diluent. This article explains what cloudiness physically is, the general categories of cause, and — the part that matters most — why the practical outcome is the same regardless of which cause applies. > **Use restriction:** Products supplied by Aus BAC Supply are for non-therapeutic purposes only. **Not for human or veterinary therapeutic use.** Never inject, ingest or self-administer. This article explains what an appearance change indicates; it does not provide reconstitution, preparation or administration instructions. ## The short answer **Cloudiness means something in the container is not in solution.** A true solution is optically clear because dissolved molecules are far smaller than the wavelength of visible light and do not scatter it. The moment particles large enough to scatter light are present — undissolved solid, a precipitate that has come out of solution, aggregated material, an immiscible phase or contamination — the liquid stops being clear. That is the entire mechanism, and it is why haze is treated as an inspection failure rather than a cosmetic issue: it is direct visual evidence that the contents are not what the label describes. ## What cloudiness physically is The effect has a name — **light scattering** — and it is the same phenomenon that makes fog visible while the water vapour in clear air is not. Suspended particles in the roughly 0.1–1 micron range scatter visible light very efficiently, which is why a vanishingly small mass of suspended material produces a very obvious haze. Two consequences follow, and both are counter-intuitive: - **The amount of material involved can be tiny.** Visible cloudiness does not imply that a large fraction of the contents has come out of solution. A trace is enough to be seen. - **Clear is not a guarantee of anything.** Scattering detects only particles above a certain size. A solution can be clear and still be wrong — degraded, contaminated with something dissolved, or past its in-use period. Clarity is a test that things can fail, not one they can pass. That second point is worth holding onto, because it is why a fixed in-use period (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last) applies to an opened vial regardless of how the contents look. ## What it can indicate In general terms, persistent haze after a diluent is added falls into a handful of categories. Which one applies in a given case is not something that can be determined by looking at it, and is not something a retailer can determine at all: - **Incomplete dissolution.** The solid has not fully gone into solution — a matter of the material's own solubility, the volume of diluent and time, all of which are governed by that material's own information. - **Precipitation.** Something that was in solution has come back out of it, often driven by a change in pH, concentration, temperature or ionic strength. - **Incompatibility.** The wrong diluent for the material. This is the reason diluent choice is specified by the product being prepared rather than chosen by preference — a preserved diluent where a preservative-free one is specified, or water where isotonic saline (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water) is specified, are different chemical environments, not interchangeable clear liquids. - **Aggregation.** Larger molecules can associate into assemblies big enough to scatter light, typically after agitation, temperature excursion or extended storage. - **Contamination.** Microbial growth or foreign particulate introduced from a non-sterile source, an unwiped stopper or a container that was never manufactured for the purpose. - **Degradation.** Material past its dating, or stored outside its labelled conditions, may no longer behave as its specification describes. > **Note what is absent from that list:** none of these categories can be told apart by eye, and several have entirely different implications. This is precisely why the response to haze is not to diagnose it. ## Bubbles and foam are not cloudiness The most frequent false alarm is gas rather than solids. Dispensing a diluent quickly, or agitating a container vigorously, entrains air and can produce a head of fine bubbles that genuinely looks like a milky haze at first glance. The distinction is straightforward and requires nothing but patience: - **Bubbles rise and clear.** Left to stand undisturbed, entrained gas migrates upward and the liquid becomes clear from the bottom of the container up, often within minutes. Foam collects as a distinct layer at the surface or a ring at the meniscus. - **Haze does not.** Suspended particulate stays distributed through the liquid, or settles to the base as a discrete deposit or film. Either way, the liquid column itself does not become clear. A container that is uniformly hazy after standing has not simply been shaken. Equally, a few bubbles clinging to a wall are not cause for concern in themselves. ## When cloudy is not wrong Here is the qualification that general web advice usually leaves out: **clear is not the expected appearance of everything.** Some presentations are formulated as suspensions or emulsions and are supposed to be uniformly cloudy; others are described in their own information as slightly opalescent, or as normally producing a faint colour. For those, *clarity* would be the anomaly. This is why the standard cannot be stated as "cloudy is bad." The standard is that **a preparation must look the way its own product information says it should look**. That document — supplied with the material, for the exact presentation in front of you — is the only authority on its expected appearance. A general page, including this one, cannot tell you what a particular material should look like. ## Is the diluent ever the cause? Occasionally, and this is worth being precise about rather than defensive. Bacteriostatic Water for Injection (https://ausbacsupply.com/product/bacteriostatic-water-30ml) is a compendial product: manufactured under pharmaceutical GMP and released against the **USP monograph**, a specification covering identity, sterility, preservative content, particulate limits, container closure integrity and a controlled pH range, with a lot number and expiry traceable to that release. A diluent held to that standard is a known, documented quantity — which is exactly what removes it from the list of variables when something looks wrong. Water of unclear origin that has been decanted into an unmarked container, or relabelled by a reseller, carries none of that documentation however similar it looks in the vial, and cannot be ruled out the same way. Two genuine diluent-side causes remain even so. The first is **the wrong diluent** — a specification question, covered above, not a quality question. The second is **a vial that itself fails inspection before use**: if the water in the vial is not clear and colourless, nothing prepared with it should be either. That case has its own guide — cloudy bacteriostatic water: what to check before you use the vial (https://ausbacsupply.com/blog/cloudy-bacteriostatic-water). What no manufacturer, and no retailer, can offer is a guarantee about a *different* substance's behaviour. A diluent's specification describes the diluent. How a given material behaves when it is dissolved is governed by that material's own formulation and information, and by how it has been stored and handled. ## The one rule that covers every case The categories above have different causes and different implications, and cannot be distinguished visually. The inspection standard resolves that by not requiring them to be distinguished at all. Pfizer's manufacturer information for Hospira Bacteriostatic Water for Injection directs that reconstituted material be inspected for clarity, unexpected precipitation and discolouration (https://www.pfizermedicalinformation.com/bacteriostatic-water/warnings). > **The rule:** where material is expected to be clear and it is cloudy, hazy, discoloured or contains visible particles, **do not use it**. This holds regardless of cause, regardless of cost, and regardless of whether it clears on standing or warming. There is no version of this where the answer is to proceed and watch. Attempting to rescue a preparation that has failed inspection — warming it, agitating it harder, filtering it, adding more diluent — is outside anything a general guide can support, and each of those actions can change the material further. Set it aside and refer to the supplied information for the material in question, and to a qualified professional. **Products supplied by Aus BAC Supply are for non-therapeutic purposes only. Not for human or veterinary therapeutic use.** Never inject, ingest or self-administer. #### FAQ Q: Why does a solution turn cloudy after a diluent is added? A: Cloudiness means something in the container is no longer in solution — commonly incomplete dissolution, precipitation, incompatibility with the diluent specified for that material, aggregation, contamination or degradation. These cannot be told apart by eye. Where material is expected to be clear and is not, do not use it. Products supplied by Aus BAC Supply are for non-therapeutic purposes only and must never be injected, ingested or self-administered. Q: Is cloudiness always a problem? A: No. Some presentations are formulated as suspensions or emulsions and are supposed to look cloudy, and others are described as slightly opalescent. The standard is that a preparation must look the way its own product information says it should — that document, for the exact presentation you hold, is the only authority on its expected appearance. Q: How do I tell bubbles from cloudiness? A: Let the container stand undisturbed. Entrained gas rises and clears, usually within minutes, and foam collects as a distinct layer at the surface. Suspended particulate stays distributed through the liquid or settles as a discrete deposit, and the liquid column does not become clear. Q: Does cloudiness go away on standing or warming? A: This is the wrong question to be asking of it. Material that is expected to be clear and is not has failed inspection, and attempting to rescue it — by warming, agitating, filtering or adding more diluent — is outside what any general guide can support and can change the material further. Set it aside. Q: Can the brand of bacteriostatic water cause cloudiness? A: An original manufacturer presentation released against the USP monograph is a documented, known quantity, which is what allows it to be ruled out as a variable. Water of unclear origin that has been decanted or relabelled cannot be ruled out the same way. But no diluent's specification can guarantee how a different substance behaves when dissolved — that is governed by the other material's own formulation, information, storage and handling. Q: Does using the wrong diluent cause cloudiness? A: It can. A preserved diluent where a preservative-free one is specified, or water where isotonic saline is specified, are different chemical environments rather than interchangeable clear liquids. Which diluent a material requires is stated in that material's own information, and that specification decides it. Q: Can a solution that looks cloudy be used? A: No. Where material is expected to be clear and it is cloudy, hazy, discoloured or contains visible particles, do not use it — regardless of the cause, and regardless of whether it appears to clear on standing. --- ### Cloudy Bacteriostatic Water: What to Check Before You Use the Vial URL: https://ausbacsupply.com/blog/cloudy-bacteriostatic-water Published: 2026-08-11 · Updated: 2026-08-15 · Topic: Troubleshooting What a bacteriostatic water vial should look like, how to inspect one properly, which appearance concerns are real and which are artefacts of the glass, and what to do with a vial that doesn't pass. Key takeaways: - Bacteriostatic water should be a clear, colourless solution, free of visible particulate. - Inspect against good light on both a white and a dark background — particles show against one or the other, rarely both. - Glass artefacts, condensation and the meniscus ring are commonly mistaken for contamination; fragments shed by a cored stopper are not. - A vial that fails inspection is not used and not salvaged — contact the supplier, and your Australian Consumer Law rights are unaffected. **Bacteriostatic water should be clear and colourless.** If the vial in front of you is cloudy, tinted, or has something visibly floating or settled in it, that vial has failed inspection and the answer is short: do not use it. What follows is how to inspect one properly, which appearance concerns turn out to be artefacts of the glass rather than the contents, and what to do about a vial that genuinely does not pass. ## What the vial should look like The contents of a 30 mL bacteriostatic water vial (https://ausbacsupply.com/product/bacteriostatic-water-30ml) are sterile water with 0.9% benzyl alcohol — two ingredients, both of which are clear liquids (https://ausbacsupply.com/blog/what-is-bac-water). There is no solute, no colouring and nothing suspended. The expected appearance is therefore about as simple as a pharmaceutical presentation gets: | Attribute | Expected | | --- | --- | | Clarity | Clear — no haze, cloudiness or opalescence | | Colour | Colourless — no yellow, brown or other tint | | Particulate | None visible — no flakes, fibres, crystals or floaters | | Fill | Consistent with the labelled volume, with normal headspace | | Closure | Flip-off cap intact and flush over an undamaged crimped collar | | Label | Original printed manufacturer label, lot and expiry readable | Anything departing from the first three rows is an appearance failure. The last three are integrity checks, and they are just as disqualifying — a vial with a lifted crimp has an unknown history whatever the liquid looks like. ## How to inspect one properly Visual inspection of injectable presentations is a real discipline with a real method, and the useful part of it is easy to borrow. Two details do most of the work: - **Use good, indirect light — not a beam through the vial.** Bright diffuse light beside the vial illuminates particles without dazzling you. A torch pointed straight at your eye through the glass washes out exactly what you are looking for. - **Look against a white background and then a dark one.** This is the step most people skip and it is the one that matters. Dark particles show against white; light-coloured fibres, flakes and bubbles show against black. Checking against one background alone reliably misses half of what is there. Swirl gently rather than shaking — enough to set the liquid rotating so anything settled at the base lifts and moves. Shaking hard entrains air and produces a bubble haze that then has to be waited out. Let the vial stand for a moment afterwards: **gas rises and clears, particulate keeps moving or settles back**. That single distinction resolves most appearance worries on the spot, and it is the same test that applies when a prepared solution looks cloudy (https://ausbacsupply.com/blog/cloudy-after-reconstitution). ## What is not a problem Several things look alarming and are not. Knowing them saves discarding a perfectly good vial: - **Bubbles clinging to the glass.** Especially after transit. They rise and clear on standing. - **The meniscus ring.** The curved surface of the liquid catches light and can read as a film or a line around the vial. - **Moulding marks and seams in the glass.** Faint lines, dimples or a slight base ring are features of the container, not the contents. They stay fixed when the liquid swirls — which is how you tell. - **Exterior condensation.** A vial brought from a cool place into a warm room fogs on the outside. It wipes off; haze in the liquid does not. > **The test that separates them:** swirl the vial and watch. Anything that belongs to the glass stays put while the liquid moves. Anything suspended in the liquid travels with it. ## What is a problem These are appearance failures, and each one ends the vial's use: - **Haze or cloudiness** through the body of the liquid that does not clear on standing. - **Any tint** — yellowing or discolouration of a solution that should be colourless. - **Visible particulate** — flakes, fibres, crystals, or anything moving with the liquid when swirled. - **A deposit or film** at the base or on the inner wall that redistributes when disturbed. - **Closure or container damage** — a broken, missing or loose flip-off cap, a lifted or damaged crimp, a chipped or cracked vial, or a stopper sitting proud. - **An unreadable or replaced label**, or a missing lot or expiry — the vial cannot be identified, which is disqualifying on its own. ## Coring: the one to know about There is one cause of visible particles specific to multi-dose vials, and it is worth understanding because it is both common and preventable. **Coring** is what happens when a needle punches out a fragment of the rubber stopper instead of parting it — the fragment drops into the solution, where it appears as a small dark floater. Repeated entries into the same spot on a stopper make it progressively more likely, which is why coring shows up in vials part-way through their in-use period rather than in new ones. Coring is a handling matter, and the technique that avoids it belongs with the qualified professional doing the work rather than in a retailer's guide. What is relevant here is the inspection consequence: **a vial with a visible fragment in it is not filtered, decanted or picked clean — it is discarded.** It is also why a multi-dose vial is inspected before *every* entry rather than only on arrival, since a vial that was clear last week may not be now. The related question of how long an opened vial remains usable is covered in how long does bacteriostatic water last (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last). ## What to do with a vial that fails The sequence is short and there is nothing to weigh up: - **Stop.** Do not use it, and do not attempt to salvage it by filtering, warming or transferring the contents. - **Keep it.** Retain the vial with its label, lot and expiry intact and photograph what you can see — the lot number is what allows the issue to be traced. - **Contact the supplier before disposing of it.** If you bought from us, email hello@ausbacsupply.com (https://ausbacsupply.com/contact) with your order number and the lot. - **Dispose of it appropriately** once the supplier has what it needs. Aus BAC Supply does not accept change-of-mind returns, and a product that arrives damaged, incorrect or not as described is a different matter entirely — **your rights under the Australian Consumer Law are not affected by any policy of ours**. The details are on our shipping and returns page (https://ausbacsupply.com/returns). ## Avoiding the problem in the first place Most appearance problems in this category trace back to provenance rather than luck. An original manufacturer presentation is released against the **USP monograph for Bacteriostatic Water for Injection** — a specification that includes particulate limits and container closure integrity, with a lot number and expiry traceable to that release. Water of unclear origin decanted into an unmarked container has none of that behind it, and there is no lot to trace when something does look wrong. Every vial we ship is an original manufacturer presentation, factory-sealed and unaltered — Aus BAC Supply does not decant, repackage or relabel (https://ausbacsupply.com/blog/who-makes-bac-water). The wider supplier checklist is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia), and storage conditions that keep a vial in specification are covered in how to store bacteriostatic water (https://ausbacsupply.com/blog/how-to-store-bacteriostatic-water). #### FAQ Q: Should bacteriostatic water be clear? A: Yes. Bacteriostatic water is sterile water with 0.9% benzyl alcohol — both clear liquids, with no solute or colouring — so the expected appearance is a clear, colourless solution free of visible particulate. Haze, any tint, or visible particles are appearance failures. Q: Why does my bacteriostatic water look cloudy? A: First rule out entrained air: let the vial stand undisturbed and see whether it clears from the bottom up, which is what bubbles do. Haze that persists through the body of the liquid is not gas, and the vial should not be used. Contact your supplier with the lot number before disposing of it. Q: What are the floating bits in my BAC water vial? A: In a vial already in use, the most common cause is coring — a needle punching out a fragment of the rubber stopper rather than parting it, which drops into the solution as a small dark floater. Fixed marks and seams in the glass are a different thing and can be identified by swirling: container features stay put while the liquid moves. Either way, a vial with visible particulate is discarded rather than filtered or picked clean. Q: How should I inspect a vial? A: Use bright indirect light beside the vial rather than a beam through it, and look against a white background and then a dark one — dark particles show against white, light fibres and bubbles against black. Swirl gently to lift anything settled, then let it stand: gas rises and clears, particulate keeps moving or settles back. Q: Can I filter or boil cloudy bacteriostatic water to fix it? A: No. A vial that has failed inspection is not salvaged by any means — filtering, warming, or transferring the contents. Set it aside, keep the label and lot intact, and contact the supplier. Q: What if my bacteriostatic water arrives damaged or cloudy? A: Contact us before using or disposing of it, with your order number and the lot number from the vial. We do not accept change-of-mind returns, but a product that arrives damaged, incorrect or not as described is a separate matter and your rights under the Australian Consumer Law are not affected by our policy. Q: Does bacteriostatic water go cloudy over time? A: An unopened vial stored in its labelled conditions should remain clear to its printed expiry. A vial already in use can develop visible particulate from stopper coring or contamination introduced at entry, which is why a multi-dose vial is inspected before every entry rather than only on arrival. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### What Are Peptides? And Why Bacteriostatic Water Keeps Coming Up URL: https://ausbacsupply.com/blog/what-are-peptides Published: 2026-08-15 · Topic: Basics What peptides actually are, why so many arrive as freeze-dried powder in a vial, and why bacteriostatic water is mentioned alongside them so often — a plain-English explainer with the Australian context. Key takeaways: - Peptides are short chains of amino acids — chemically the same building blocks as proteins, in shorter form. - Many peptide products are supplied as freeze-dried (lyophilised) powder because the dry form is far more stable than a solution. - A freeze-dried powder must be dissolved in a compatible diluent before it can be measured as a liquid — which is why bacteriostatic water appears alongside peptides so often. - In Australia, peptides supplied for therapeutic use are typically prescription medicines; everything about their preparation and use belongs with the prescriber, pharmacist and product information. - Products supplied by Aus BAC Supply are for non-therapeutic purposes only — never inject, ingest or self-administer. ## The short answer **A peptide is a short chain of amino acids — the same building blocks that make up proteins, in a shorter string.** The reason peptides and **bacteriostatic water** appear in the same sentence so often is practical rather than chemical: many peptide products are supplied as a freeze-dried powder in a sealed vial, and a powder has to be dissolved in a compatible liquid before it can be measured as a liquid at all. This article explains the vocabulary; it does not provide preparation or administration instructions, which belong with the product information and a qualified healthcare professional. Products supplied by Aus BAC Supply are for non-therapeutic purposes only — not for human or veterinary therapeutic use. ## What a peptide is Amino acids join end-to-end through peptide bonds. A short chain — conventionally up to around fifty amino acids — is called a peptide; longer chains that fold into complex structures are proteins. The boundary is a naming convention, not a change in chemistry. Peptides are everywhere in normal biology: several human hormones are peptides, and fragments of larger proteins — collagen peptides in cosmetics are a familiar example — are peptides too. In commerce the word covers a wide range of products: prescribed and compounded medicines, research compounds, and cosmetic ingredients. Which category a given product falls into determines how it is regulated and who may supply it. ## Why peptides arrive freeze-dried Many peptides are unstable in solution: with water present, chains can gradually break down or clump together. Freeze-drying — **lyophilisation** — removes the water from a frozen solution under vacuum, leaving a dry plug or powder that is far more stable in storage. That is why a peptide vial so often contains a small white cake rather than a liquid. The consequence is unavoidable: **a freeze-dried powder cannot be measured as a liquid until it has been dissolved** — returned to solution in a compatible liquid. That step is called reconstitution (https://ausbacsupply.com/glossary#reconstitution), and the liquid used is called a diluent. ## Where bacteriostatic water fits in Bacteriostatic water (https://ausbacsupply.com/blog/what-is-bac-water) is sterile water with 0.9% benzyl alcohol added as a bacteriostatic preservative, supplied as a multi-dose vial — a sealed vial that can be entered more than once across a finite in-use period. Preservative-free sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water), by contrast, is labelled for a single withdrawal. That difference in vial labelling is why the preserved, multi-dose presentation is the one peptide users search for. Which diluent a given preparation actually requires is stated in that product's own information and confirmed by a qualified professional — it is a label question, not a preference. Our companion guide covers the buying side: bacteriostatic water for peptides in Australia (https://ausbacsupply.com/blog/bacteriostatic-water-for-peptides-australia). ## What bacteriostatic water does not do - **It is not a medicine and contains no active ingredient.** It is a diluent — water and preservative, nothing else. - **It does not make anything "work better".** The preservative protects the diluent vial from bacterial growth between entries; it has no effect on the material being dissolved. - **It does not sterilise.** A bacteriostatic agent inhibits growth; it cannot rescue contaminated material or replace the labelled handling requirements. - **It does not guarantee clarity.** If reconstituted material looks cloudy, that is a property of the material and its handling — see what cloudiness actually tells you (https://ausbacsupply.com/blog/cloudy-after-reconstitution). ## The Australian context In Australia, peptides supplied for therapeutic use are typically prescription medicines, sometimes prepared by compounding pharmacies against an individual prescription within limits the TGA has been tightening, under the therapeutic-goods framework it administers. Nothing about that pathway is a retailer's to advise on: the prescriber and pharmacist own product selection, preparation and use, and the supplied product information governs. What a retailer can responsibly supply is the sealed, manufacturer-labelled diluent presentation itself. We stock the original manufacturer bacteriostatic water (https://ausbacsupply.com/shop/bacteriostatic-water) and bacteriostatic sodium chloride (https://ausbacsupply.com/shop/bacteriostatic-saline) vials, factory-sealed with lot and expiry intact, dispatched from Melbourne. #### FAQ Q: What are peptides in simple terms? A: Short chains of amino acids — the same building blocks as proteins, in shorter strings. Several human hormones are peptides, and the word also covers prescribed medicines, research compounds and cosmetic ingredients. Q: Are peptides the same as proteins? A: Chemically they are built from the same amino acids. By convention, short chains — up to around fifty amino acids — are called peptides, and longer folded chains are proteins. Q: Why are peptides freeze-dried? A: Because many peptides slowly degrade in solution — chains break down or clump together with water present. Freeze-drying (lyophilisation) removes the water, leaving a far more stable dry powder for storage and transport. Q: What does bacteriostatic water have to do with peptides? A: A freeze-dried powder must be dissolved in a compatible diluent before it can be measured as a liquid. Bacteriostatic water is a multi-dose diluent presentation, which is why it is so often mentioned alongside peptides. Which diluent a given preparation requires is stated in its own product information. Q: Are peptides legal in Australia? A: It depends on the specific product and how it is scheduled and supplied — peptides supplied for therapeutic use are typically prescription-only medicines, and their supply is regulated regardless of what a purchase is called. Questions about a specific product belong with a pharmacist or prescriber. Q: Does bacteriostatic water contain peptides? A: No. It is a diluent — sterile water with 0.9% benzyl alcohol as a preservative — and contains no active ingredient of any kind. --- ### Bacteriostatic Water for Peptides in Australia: What to Know Before You Buy URL: https://ausbacsupply.com/blog/bacteriostatic-water-for-peptides-australia Published: 2026-08-15 · Topic: Buying Guide Why peptide users look for bacteriostatic water, what the manufacturer's multi-dose vial actually is and is not, and the checks that matter when buying it in Australia — without any preparation instructions. Key takeaways: - Peptide buyers look for bacteriostatic water because it is the multi-dose diluent presentation — a sealed vial labelled for repeated entry. - The vial is a diluent only: water and preservative, no active ingredient, and never for injection by itself. - Buy an original manufacturer presentation — intact seal, printed label, visible lot and expiry — from a verifiable Australian supplier. - Which diluent a given preparation requires is a product-information question for a qualified professional, not a retailer recommendation. - Products supplied by Aus BAC Supply are for non-therapeutic purposes only — never inject, ingest or self-administer. ## The short answer **Bacteriostatic water is the multi-dose diluent presentation — and that is the whole reason peptide users search for it.** Where freeze-dried material is prepared and used across days rather than minutes, the two diluent presentations are not labelled the same way: a preservative-free sterile water vial is labelled for a single withdrawal, while the bacteriostatic presentation is labelled multi-dose. Which of them a particular preparation requires is stated in its own product information. This guide covers what the vial is, what it is not, and what to check before buying one in Australia. It contains no preparation or administration instructions: those belong with the product information of whatever is being prepared and a qualified healthcare professional. > **Use restriction:** Products supplied by Aus BAC Supply are for non-therapeutic purposes only. **Not for human or veterinary therapeutic use.** Never inject, ingest or self-administer. This article does not provide reconstitution, preparation or administration instructions. > **New to the vocabulary?** Start with what peptides are and why they arrive freeze-dried (https://ausbacsupply.com/blog/what-are-peptides) — this guide picks up at the buying decision. ## Why peptide buyers look for BAC water A freeze-dried peptide product cannot be measured as a liquid until it has been dissolved in a compatible diluent. Where the resulting solution is used across days rather than minutes, the difference that matters is on the diluent's own label: **preservative-free sterile water is labelled single-use** — one withdrawal, then discard — while **bacteriostatic water's 0.9% benzyl alcohol lets the manufacturer label the sealed vial multi-dose**. That labelling contrast is why searches for a diluent that spans days land on the multi-dose vial rather than a drawer of single-use ampoules. To be precise about what that means — and what it does not: the multi-dose label describes the *diluent vial*. It says nothing about what any particular preparation requires, which is stated in that product's own information. The comparison is covered fully in bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water). ## The vial itself The presentation we stock is the original 30 mL multi-dose vial (manufactured by Hospira, a Pfizer company), factory-sealed: | Detail | Bacteriostatic Water for Injection | | --- | --- | | Volume | 30 mL multi-dose vial | | Composition | Sterile water + 0.9% (9 mg/mL) benzyl alcohol | | Specification | Bacteriostatic Water for Injection, USP — sterile and nonpyrogenic | | Closure | Rubber stopper, crimped collar, flip-off cap | | Labelling | Printed manufacturer label with lot and expiry | | Role | Diluent or solvent only — never injected by itself | The compendial specification matters more than branding: a USP-released diluent is manufactured to controlled limits for sterility, preservative content and particulates. What that specification does and does not promise for reconstitution clarity is covered in who makes BAC water (https://ausbacsupply.com/blog/who-makes-bac-water). ## What it will not do - **It is not a medicine.** Water and preservative, no active ingredient — and never for injection by itself. - **It will not sterilise anything.** The preservative inhibits bacterial growth inside the diluent vial between entries; it cannot rescue contaminated material. - **It will not guarantee a clear result.** If reconstituted material turns cloudy, the diluent is rarely the cause — see what cloudiness actually tells you (https://ausbacsupply.com/blog/cloudy-after-reconstitution). - **It will not tell you how to prepare anything.** Volumes, technique and use are matters for the prepared product's information and a qualified professional — not this site. ## The checks before you buy The bacteriostatic water market attracts decanted and relabelled product, so the buying checks are not paranoia — they are the point: - **Intact factory seal** — flip-off cap present, flush and unbroken over a crimped collar. - **Original printed label** — not a sticker over another label — with manufacturer, composition, volume, lot and expiry all legible. - **A verifiable supplier** — legal operator, ABN, physical location, contactable support and a published returns policy. The full 4-point checklist, with the red flags to walk away from, is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia). ## Storage and the in-use clock Two dates govern every vial: the printed expiry on the sealed vial, and a much shorter in-use period once the stopper is first entered — 28 days is the figure commonly stated for benzyl-alcohol-preserved presentations, and any figure in the product information supplied with the exact vial governs. Storage conditions are printed on the label, and a multi-dose vial is inspected before every entry: one that is cloudy, discoloured or carries visible particles fails inspection regardless of dates. The detail lives in how to store bacteriostatic water (https://ausbacsupply.com/blog/how-to-store-bacteriostatic-water) and expiry and in-use dating (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last). ## Buying it in Australia Most community pharmacies do not stock multi-dose bacteriostatic presentations — calling around chemists (https://ausbacsupply.com/blog/bac-water-near-me-australia) usually ends online. We stock the original manufacturer's 30 mL vial in singles and multi-packs in our bacteriostatic water range (https://ausbacsupply.com/shop/bacteriostatic-water), factory-sealed and unaltered, dispatched same business day from Melbourne before the 2 pm cutoff with tracked Australia-wide delivery. Where a preparation's own product information specifies saline instead, the BAC sodium chloride 0.9% presentation (https://ausbacsupply.com/shop/bacteriostatic-saline) is stocked the same way. #### FAQ Q: Why do peptide users buy bacteriostatic water? A: Because it is the multi-dose diluent presentation: 0.9% benzyl alcohol lets the manufacturer label a sealed vial for repeated entry, where preservative-free sterile water is labelled for a single withdrawal. Which diluent a given preparation requires is stated in that product's own information. Q: Is sterile water interchangeable with bacteriostatic water for peptide preparations? A: Do not assume the two are interchangeable — they carry different labels, and preservative-free sterile water is single-use. The compatible diluent for any preparation is a question for its product information and a qualified healthcare professional. Q: Is bacteriostatic water a peptide? A: No. It contains no active ingredient at all — it is sterile water with 0.9% benzyl alcohol as a preservative, supplied as a diluent. Q: How long does bacteriostatic water last once opened? A: An opened multi-dose vial has a finite in-use period much shorter than its printed expiry — 28 days is commonly stated for benzyl-alcohol-preserved presentations, and any figure in the supplied product information governs. Whichever date arrives first ends the vial's usable life. Q: Does bacteriostatic water need to be refrigerated? A: Follow the storage conditions printed on the exact vial and its product information rather than assuming a rule. Our storage guide covers what to check on receipt and before the vial is entered. Q: Where can I buy bacteriostatic water for peptides in Australia? A: Most chemists do not stock multi-dose bacteriostatic presentations, so buyers order online. Aus BAC Supply stocks the original manufacturer's factory-sealed 30 mL vial, dispatched Australia-wide from Melbourne. Products are not for human or veterinary therapeutic use and must never be injected by themselves. Sources: - Therapeutic Goods Administration — Australian Government Department of Health and Aged Care (https://www.tga.gov.au/) --- ### Where to Buy Bacteriostatic Saline (0.9% Sodium Chloride) in Australia URL: https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-saline-australia Published: 2026-08-17 · Topic: Buying Guide What to check before buying bacteriostatic sodium chloride in Australia — why chemists rarely stock it, how to tell an original manufacturer presentation from a decanted one, and what a legitimate Australian seller publishes. Key takeaways: - Bacteriostatic saline is not a routine community-pharmacy stock line in Australia, so buying online is the normal route. - The thing to verify is the presentation: an original manufacturer vial, factory-sealed, with a printed label and visible lot and expiry. - A seller that decants, repackages or applies its own label is selling something different from the manufacturer presentation, whatever the price says. - An Australian seller with a published legal entity and returns policy leaves your consumer-law rights intact; an offshore one effectively does not. - Bacteriostatic saline and bacteriostatic water are not interchangeable — the product information for whatever is being prepared specifies which. **Bacteriostatic sodium chloride 0.9%** — BAC saline — is straightforward to buy in Australia once you know that a pharmacy counter is not where it happens. This guide covers why that is, and what separates a genuine manufacturer presentation from something that merely looks like one. ## Why the chemist says no Multi-dose bacteriostatic presentations are not a routine community-pharmacy line anywhere in Australia. A pharmacy dispenses against prescriptions and stocks what its patients regularly need; a preserved multi-dose diluent vial is not that, and most pharmacists will not order a single one in for a retail customer. This is the same answer people get when ringing around chemists for BAC water (https://ausbacsupply.com/blog/bac-water-near-me-australia), and for the same reason. Online is the normal route, which shifts the question from *where* to *who*. ## What you are actually buying The product is isotonic 0.9% sodium chloride preserved with benzyl alcohol (https://ausbacsupply.com/blog/what-is-bacteriostatic-sodium-chloride), supplied in a sealed multi-dose vial. The words that matter on a listing are **original manufacturer presentation**: the vial as the manufacturer filled, sealed and labelled it, not a solution transferred into a different container by whoever is selling it. A genuine presentation shows four things, and you should be able to see all of them before paying: - **An intact factory seal** — the flip-top cap unbroken, as it left the fill line. - **The manufacturer's printed label**, naming the product and the manufacturer — not a sticker applied by the retailer. - **A visible lot number**, which is what makes the vial traceable to a batch at all. - **A visible expiry date** that has not passed and is not about to. ## The decanting problem The single biggest difference between sellers in this category is whether they decant. Decanting means drawing bulk solution into smaller vials and labelling them in-house. The result may be cheaper and it may look similar, but it is no longer the manufacturer's presentation: the seal is not the manufacturer's, the label is not the manufacturer's, and the lot number no longer traces to a batch record you or anyone else can check. Nothing about a decanted vial can be verified from the outside, which is precisely the problem. The tell is usually the photography. Original presentations are photographed as the manufacturer's vial, because that is the selling point. Decanted product tends to be photographed as an anonymous vial with a plain or house-branded label, and described in terms of volume and price rather than manufacturer and presentation. ## Checking the seller An Australian seller that intends to be around publishes the things that make it accountable. Before ordering, look for: - **A legal entity and ACN or ABN** you can look up in the national register — not just a trading name. - **A published returns policy** that does not attempt to exclude your rights under Australian Consumer Law, because it cannot. - **A real contact route** — an email and phone number attached to a person, in your own timezone. - **Clear dispatch information**: where the parcel ships from, the handling time and the delivery estimate, stated before you pay. Buying offshore is where these quietly stop applying. An international order can be held at the border, arrives without a domestic return path, and leaves a dispute that is expensive to pursue and usually not worth pursuing. Against that, the local premium is generally smaller than it looks. ## Saline or water? Worth settling before you order, because the two vials look alike and are not substitutes. Bacteriostatic water (https://ausbacsupply.com/shop/bacteriostatic-water) contains no solute; bacteriostatic saline is isotonic 0.9% sodium chloride. Both carry the same benzyl alcohol preservative, so the preservative is never the difference — the solute is (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-bacteriostatic-water). Which one a given preparation requires is specified in that preparation's own manufacturer product information, and that specification decides it. It is not a preference, and it is not something a retailer can advise on. ## Buying from us Aus BAC Supply stocks the original manufacturer's bacteriostatic 0.9% sodium chloride 30 mL multi-dose vial (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) — factory-sealed, manufacturer-labelled, never decanted or relabelled — in singles and multi-vial packs. We are an Australian proprietary company with a published ACN, we dispatch from Melbourne with tracked delivery Australia-wide, and our shipping and returns terms (https://ausbacsupply.com/returns) are on the site rather than behind a support ticket. The full range is on the bacteriostatic saline shop page (https://ausbacsupply.com/shop/bacteriostatic-saline). These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Compatibility, preparation, storage and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: Can you buy bacteriostatic saline in Australia? A: Yes. It is not a routine community-pharmacy stock line, so it is bought online. Aus BAC Supply stocks the original manufacturer's 30 mL multi-dose presentation and dispatches from Melbourne with tracked delivery Australia-wide. Q: Why don't chemists stock bacteriostatic sodium chloride? A: A community pharmacy stocks what its patients regularly need against prescriptions, and a preserved multi-dose diluent vial is not that. Most will not order a single vial in for a retail customer, which is why buyers end up online. Q: How do I know a vial is an original manufacturer presentation? A: You should be able to see an intact factory seal, the manufacturer's own printed label naming the product and manufacturer, a lot number and an expiry date. A retailer-applied label or an anonymous vial indicates the product has been decanted or relabelled. Q: Is decanted bacteriostatic saline a problem? A: It is a different thing from the manufacturer presentation. Once solution has been transferred to another container and labelled in-house, the seal, the label and the traceable lot number are no longer the manufacturer's, so nothing about the vial can be verified from the outside. Q: Is bacteriostatic saline interchangeable with bacteriostatic water? A: No. Both are preserved with benzyl alcohol, but bacteriostatic water contains no solute while bacteriostatic saline is isotonic 0.9% sodium chloride. The product information for whatever is being prepared specifies which diluent it requires. Q: Is it cheaper to buy from overseas? A: Sometimes on the listed price, rarely once the rest is counted. An international parcel can be held at the border, arrives with no domestic return path and leaves a dispute under another country's law. Australian Consumer Law applies in full to a domestic purchase. Sources: - Therapeutic Goods Administration — Australian Government Department of Health and Aged Care (https://www.tga.gov.au/) --- ### Bacteriostatic Saline vs Sterile Water: Two Differences, Not One URL: https://ausbacsupply.com/blog/bacteriostatic-saline-vs-sterile-water Published: 2026-08-17 · Topic: Comparisons Bacteriostatic sodium chloride and sterile water for injection differ in both tonicity and preservation. Why that makes them the easiest pair to confuse, and what each vial's labelling actually permits. Key takeaways: - They differ on two axes at once: one carries a solute and the other doesn't, and one is preserved while the other isn't. - Bacteriostatic saline is isotonic 0.9% sodium chloride preserved with benzyl alcohol, in a multi-dose vial. - Sterile water for injection is solute-free and preservative-free, and its vial is labelled single-dose. - Because two variables change together, this is the pairing most easily got wrong — the other comparisons each move one. - Which is required is stated in the product information for whatever is being prepared, and is not a retailer's call. Most of the diluent comparisons on this site change one variable. Bacteriostatic water versus sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water) is the preservative alone. Bacteriostatic saline versus plain saline (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-preservative-free-saline) is also the preservative alone. **Bacteriostatic saline versus sterile water changes both at once**, which is exactly why it is the pairing people muddle. ## Two differences at once Set them out and the structure is obvious: - **Bacteriostatic sodium chloride 0.9%** — contains a solute (salt, at an isotonic concentration) *and* a preservative (benzyl alcohol). Multi-dose vial. - **Sterile Water for Injection** — contains no solute *and* no preservative. Single-dose vial. Every other pairing in this family holds one of those constant. This one holds neither, so reasoning about it by analogy with the others is where mistakes come from. ## The solute Sterile water is water and nothing else — released against the USP monograph for injectable water, with no added substances of any kind. Bacteriostatic saline carries sodium chloride at 0.9%, which is 9 mg per mL, the concentration at which the solution is **isotonic**. That is a real physical difference between the two liquids, not a labelling one, and it is why the manufacturer information for a given preparation names one or the other rather than treating them as a category. The consequence of solute-free water being solute-free is stated plainly on the manufacturer's own labelling: intravenous administration of Sterile Water for Injection without a solute may cause haemolysis. It is a diluent, and only a diluent. ## The preservative Benzyl alcohol at 0.9% is the bacteriostatic agent in the saline presentation. It inhibits the growth of most common contaminating organisms rather than killing them — the distinction is covered in how the preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water) — and it is the only reason a sealed vial can be labelled for more than one entry. Sterile water has none, which is why its vial is a single-dose presentation: once the closure is breached there is nothing holding growth in check, and the labelling reflects that. This is the difference that governs how each vial may be handled after opening, and it is not a matter of degree. A single-dose vial does not become multi-dose because there is solution left in it. ## Side by side | | Bacteriostatic saline 0.9% | Sterile water for injection | | --- | --- | --- | | Solute | Sodium chloride, 9 mg/mL | None | | Tonicity | Isotonic | Not isotonic — no solute | | Preservative | 0.9% benzyl alcohol | None | | Vial labelling | Multi-dose | Single-dose | | Repeat entry | Permitted within the labelled in-use period | Not permitted | | Shop | BAC saline range (https://ausbacsupply.com/shop/bacteriostatic-saline) | Sterile water (https://ausbacsupply.com/product/sterile-water) | ## What decides it Not price, not availability, and not which vial is already in the drawer. The manufacturer product information for whatever is being prepared specifies the compatible diluent, and that specification is the answer. A retailer cannot make that determination for you and should not offer to; nor can the diluent's own manufacturer, whose documentation describes the diluent and nothing about what it might be combined with. If your requirement is a multi-dose presentation and the product information permits water rather than saline, bacteriostatic water (https://ausbacsupply.com/shop/bacteriostatic-water) is the preserved solute-free option and is the more commonly stocked of the two. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Compatibility, preparation, storage and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What is the difference between bacteriostatic saline and sterile water? A: Two differences at once. Bacteriostatic saline contains sodium chloride at an isotonic 0.9% and benzyl alcohol as a preservative, and its vial is multi-dose. Sterile water for injection has neither solute nor preservative, and its vial is single-dose. Q: Can sterile water be used instead of bacteriostatic saline? A: That is determined by the product information for whatever is being prepared, which names the compatible diluent. The two are not interchangeable by default — they differ in both tonicity and preservation. Q: Why is sterile water single-dose? A: Because it contains no preservative. Nothing inhibits microbial growth once the closure has been breached, so the manufacturer labels the vial for a single withdrawal. Q: Is bacteriostatic saline just sterile water with salt in it? A: It also has a preservative, which is the difference people miss. Adding salt to sterile water would change the tonicity but not make the vial multi-dose — the benzyl alcohol is what does that. Q: Which is more commonly stocked? A: Bacteriostatic water is the most commonly stocked of the multi-dose presentations, followed by bacteriostatic saline. Availability should not decide which one a preparation requires. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - Bacteriostatic 0.9% Sodium Chloride Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### What Is Sterile Water for Injection? URL: https://ausbacsupply.com/blog/what-is-sterile-water-for-injection Published: 2026-08-17 · Topic: Basics Sterile Water for Injection explained: what the monograph requires, why the vial is single-dose, why it is never given without a solute, and how it differs from saline, distilled water and irrigation water. Key takeaways: - Sterile Water for Injection is water alone — no solute, no preservative, no buffer — released against a pharmacopoeial monograph. - It is a diluent or solvent, never a product to be administered on its own. - The manufacturer warns that intravenous administration without a solute may cause haemolysis. - Its vial is labelled single-dose because there is no preservative to hold growth in check after entry. - It is not the same as sterile saline, distilled water, or water for irrigation, each of which is a distinct specification. **Sterile Water for Injection** is exactly what the name says and nothing more: water, sterilised, released against a pharmacopoeial monograph for injectable use, with no solute, no preservative, no buffer and no antimicrobial agent of any kind. Everything else about it follows from that absence. ## What it is It exists to be a solvent. A great many medicines are supplied as a dry powder because they are not stable in solution, and they need a liquid added before use. Sterile water is the most neutral thing that can perform that role — the specification is designed around what has been *excluded* rather than what has been added. That neutrality is the whole point. Any added substance, including a preservative, is one more thing that could interact with whatever the water is being combined with. Where a preparation's product information wants nothing else present, sterile water is what it names. ## What the monograph requires "Sterile" here is a released specification, not a description of how clean the water looks. A presentation of Sterile Water for Injection is manufactured and tested against a monograph — the USP monograph in the presentations commonly supplied in Australia — which sets requirements for sterility, for the absence of pyrogens, for particulate matter and for the container closure. **Non-pyrogenic** is the term you will see alongside sterile: free of the fever-inducing bacterial breakdown products that survive sterilisation and are not removed by it. This is what separates it from water that is merely very pure. Purity is a chemistry question; the monograph is a manufacturing and release question, and it is the reason the two are not substitutable — see sterile water vs distilled water (https://ausbacsupply.com/blog/sterile-water-vs-distilled-water). ## Why the vial is single-dose Because nothing in it inhibits microbial growth. Once a closure has been breached, a preserved solution has benzyl alcohol holding contamination in check for a defined in-use period; unpreserved water has nothing at all. The manufacturer therefore labels the vial for a *single* withdrawal, and that labelling is not a conservative suggestion — it reflects the absence of the only thing that would make repeat entry defensible. If a multi-dose presentation is what is required, the preserved equivalent is bacteriostatic water (https://ausbacsupply.com/blog/what-is-bac-water), which is the same water with 0.9% benzyl alcohol added. The comparison is set out in bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water). A single-dose vial does not become multi-dose because solution remains in it. ## Why it is never given alone The manufacturer's own product information carries the warning plainly: intravenous administration of Sterile Water for Injection without a solute may cause haemolysis — the rupture of red blood cells. Water with nothing dissolved in it is not isotonic with blood, and that difference has a physiological consequence. So sterile water is a component, never a product in itself. It goes into something; it is not administered as something. This is true of every diluent discussed on this site, but it is most consequential here, because sterile water is the one with no solute at all. ## What it is not - **Not sterile saline.** Saline carries sodium chloride at 0.9% and is isotonic. Sterile water carries nothing — see bacteriostatic saline vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-saline-vs-sterile-water). - **Not distilled water.** Distillation is a purification method, not a release specification, and distilled water is not manufactured or tested for injectable use. - **Not water for irrigation.** A separate monograph for a different purpose, in different containers, and not interchangeable with the injectable presentation. - **Not bacteriostatic water.** Same water, plus a preservative, plus a multi-dose label. The preservative is the entire difference. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Compatibility, preparation, storage and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What is Sterile Water for Injection? A: Water alone — sterilised and released against a pharmacopoeial monograph for injectable use, with no solute, preservative or buffer. It is a diluent or solvent for medicines supplied as a dry powder. Q: Why is sterile water single-dose? A: Because it contains no preservative. Nothing inhibits microbial growth once the closure is breached, so the manufacturer labels the vial for a single withdrawal. Q: Can sterile water be injected on its own? A: No. The manufacturer product information warns that intravenous administration without a solute may cause haemolysis. It is a component of a preparation, never a preparation in itself. Q: What is the difference between sterile water and bacteriostatic water? A: Bacteriostatic water is the same water with 0.9% benzyl alcohol added as a preservative, which is what allows its vial to be labelled multi-dose. Sterile water has no preservative and is single-dose. Q: Is sterile water the same as distilled water? A: No. Distillation is a purification method; the injectable presentation is manufactured and released against a monograph covering sterility, pyrogens, particulates and the container closure. Distilled water is not made or tested for injectable use. Q: Does Aus BAC Supply stock sterile water? A: Sterile water presentations are listed but not currently in stock. Bacteriostatic water — the same water with a preservative added, in a multi-dose vial — is stocked and dispatched from Melbourne. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - United States Pharmacopeia — National Formulary (USP–NF) — United States Pharmacopeial Convention --- ### Insulin Syringe Sizes Explained: Units, Gauge and Length URL: https://ausbacsupply.com/blog/insulin-syringe-sizes-explained Published: 2026-08-17 · Topic: Lab Supplies What the numbers on an insulin syringe mean — barrel capacity in units, needle gauge, needle length, and what U-100 actually refers to. A specification guide, not a usage guide. Key takeaways: - Three numbers describe an insulin syringe: barrel capacity, needle gauge and needle length. - U-100 is a graduation scale, not a size — it means the barrel is marked in units for U-100 strength fluid. - Gauge runs backwards: a higher gauge number is a thinner needle. - A smaller barrel is easier to read at small volumes, which is the usual reason to choose one. - Aus BAC Supply supplies syringes as lab consumables; selection and use are matters for a qualified professional. An insulin syringe is described by three numbers, and the labelling convention makes two of them counter-intuitive. This is a guide to reading the specification — what the figures on the packet mean and how they relate. It is not a guide to selecting or using one, which is a matter for a qualified professional. ## Three numbers Every insulin syringe specification is some combination of: - **Barrel capacity**, given in units — 30, 50 or 100 — and sometimes also in millilitres. - **Needle gauge**, a number describing the needle's outside diameter, written as 29G, 30G, 31G and so on. - **Needle length**, in millimetres, commonly between 4 mm and 13 mm. A packet described as "1 mL U-100, 29G x 13 mm" has given you all three. Take them one at a time. ## What U-100 means This is the figure most often misread as a size. **U-100 is a graduation scale.** It means the barrel is marked in units calibrated for fluid at U-100 strength, where 100 units occupy 1 mL. So on a U-100 syringe, 1 unit of scale equals 0.01 mL of volume, and the scale and the volume are locked to each other by that ratio. Two consequences follow. A U-100 syringe holding "100 units" holds 1 mL. And the unit markings are only meaningful for U-100 strength fluid — reading a unit scale against something at a different concentration is simply reading the wrong scale. ## Barrel capacity The three common barrels are 0.3 mL (30 units), 0.5 mL (50 units) and 1 mL (100 units). The trade-off is resolution against capacity: the same 100 units of scale, printed along a shorter barrel, gives finer-spaced markings that are easier to read accurately at small volumes. A 1 mL barrel covers more in one draw but crowds its graduations. This is the usual reason one barrel is preferred over another — legibility at the volume actually being measured, rather than capacity for its own sake. ## Gauge runs backwards Needle gauge is the one specification that behaves opposite to intuition: **a higher gauge number means a thinner needle.** A 31G needle is finer than a 29G. The convention descends from wire-drawing, where the number counted drawing passes rather than measuring diameter directly, and it has stuck. Thinner is not automatically better. A finer needle has a narrower bore, so fluid moves through it more slowly — which is noticeable with a viscous fluid and irrelevant with a watery one. ## Needle length Given in millimetres, typically 4 mm to 13 mm on insulin syringes. Unlike gauge, this number is literal: 8 mm is longer than 6 mm. Length is quoted alongside gauge because the two together describe the needle, and a specification that gives only one is incomplete. ## What we supply Aus BAC Supply stocks insulin syringes in 20-packs (https://ausbacsupply.com/product/syringes-insulin-20pk) as a laboratory consumable, individually wrapped and sterile, and also as part of a starter kit paired with bacteriostatic water (https://ausbacsupply.com/shop). The full specification for the pack we carry is on the product page rather than summarised here, so what you read is the specification of the item actually in stock. We supply these as lab consumables and do not advise on selection or use. Which syringe is appropriate for any given task, and whether a task is appropriate at all, is a matter for a qualified professional working from the relevant product information. Products supplied by Aus BAC Supply are not for human or veterinary therapeutic use. #### FAQ Q: What does U-100 mean on a syringe? A: It is a graduation scale, not a size. The barrel is marked in units calibrated for fluid at U-100 strength, where 100 units occupy 1 mL — so one unit of scale corresponds to 0.01 mL. Q: Is a higher gauge needle thicker or thinner? A: Thinner. Needle gauge runs backwards: a 31G needle is finer than a 29G. The convention comes from wire-drawing, where the number counted drawing passes rather than measuring diameter. Q: What is the difference between a 0.5 mL and a 1 mL insulin syringe? A: Capacity and resolution. A 0.5 mL barrel holds 50 units and a 1 mL barrel holds 100, but the shorter barrel spaces its graduations further apart, which makes small volumes easier to read accurately. Q: How many units are in 1 mL? A: On a U-100 syringe, 100 units. That ratio is what the U-100 scale means, and it holds only for fluid at U-100 strength. Q: Does Aus BAC Supply advise on which syringe to use? A: No. We supply syringes as laboratory consumables. Selection and use are matters for a qualified professional working from the relevant product information. Sources: - ISO 8537 — Sterile single-use syringes, with or without needle, for insulin — International Organization for Standardization --- ### How Many Times Can You Use a Multi-Dose Vial? URL: https://ausbacsupply.com/blog/how-many-times-can-you-use-a-multi-dose-vial Published: 2026-08-18 · Topic: Handling “Multi-dose” on a vial label permits repeated access — it does not set a number of uses. What actually limits a bacteriostatic water vial, why no maximum entry count is printed anywhere, and how a single-dose presentation differs. Key takeaways: - “Multi-dose” describes what the presentation permits, not a number of withdrawals — no label states a maximum entry count. - What ends a vial's life is the in-use period and the printed expiry, whichever falls first, not a tally of entries. - Each entry is an opportunity for contamination and for coring; the preservative slows growth and does nothing about either. - A single-dose presentation such as sterile water is not a multi-dose vial used carefully — it is one withdrawal, then discard. - The supplied manufacturer product information governs. Use is a matter for a qualified healthcare professional. **There is no number.** No manufacturer prints a maximum entry count on a multi-dose vial, and none of the product information for these presentations sets one. That is not an oversight — a count is the wrong unit for the thing being limited, and this guide explains what the real limit is. ## The short answer A vial labelled multi-dose may be entered more than once. How many times is governed by two dates — the **in-use period** that starts at first entry, and the **printed expiry** on the sealed vial — together with the condition of the solution at every single entry. Whichever date falls first ends the vial, no matter how much is left in it and no matter how few times it has been accessed. ## What "multi-dose" actually means "Multi-dose" (or "multiple-dose") is a statement about the *presentation*, not a permission slip with a quota attached. It tells you the manufacturer has formulated and tested the product for repeated access to the sealed container — which, for bacteriostatic water, is possible because 0.9% benzyl alcohol has been added as a preservative. That is the whole of what the phrase claims. What it does not claim is that the contents remain sterile after entry, that the preservative keeps working indefinitely, or that ten entries are safer than twelve. As the guide to how the preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water) sets out, a bacteriostatic agent inhibits the growth of most common bacteria. It suppresses; it does not sterilise, and it cannot undo a contamination event. ## What limits the vial instead Three things end a multi-dose vial's usable life, and none of them is an entry count: - **The in-use period.** A fixed window running from the first time the stopper is pierced. It is stated in the supplied product information; 28 days is the period commonly stated for benzyl-alcohol-preserved multi-dose presentations, but the figure supplied with your vial is the authority. Expiry and in-use dating (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last) covers both dates in full. - **The printed expiry.** It applies to the sealed presentation and does not extend because the vial was opened late. If it falls inside the in-use period, it wins. - **Inspection, every time.** Anything cloudy, discoloured or carrying visible particulate ends the vial on the spot, whatever the dates say. That check is not once at the start — it is before each entry, and what to look for (https://ausbacsupply.com/blog/cloudy-bacteriostatic-water) has its own guide. > **The date of first entry is the one nobody remembers.** It is recorded on the vial or its carton at the time, because a fortnight later the recollection is a guess, and a guess is not an in-use period. ## What each entry costs you If the limit is a period rather than a count, why does the number of entries matter at all? Because each one carries two risks the calendar knows nothing about. The first is **contamination**. Every pass through the stopper is an opportunity to introduce something, and the preservative's job is to hold what gets in at bay — a margin that is finite and that nothing replenishes. The second is **coring**: a needle punching out a fragment of the rubber stopper instead of parting it cleanly, leaving that fragment in the solution. Coring becomes more likely with repeated entries through the same point on a stopper, which is the practical reason repeated access is not free even inside a valid in-use period. A vial with visible particulate is discarded, not filtered. ## Single-dose is not "multi-dose, carefully" The distinction is categorical. A preservative-free presentation such as sterile water (https://ausbacsupply.com/product/sterile-water) is labelled single-dose because there is no bacteriostatic agent in it at all — nothing holds growth in check between entries, so the presentation is intended for one withdrawal and is then discarded. Careful technique does not convert it into a multi-dose vial, and the remaining volume is not a reason to re-enter it. Which of the two applies to a given task is not a preference. Bacteriostatic water vs sterile water (https://ausbacsupply.com/blog/bacteriostatic-water-vs-sterile-water) sets out the composition difference; the selection itself belongs to a qualified healthcare professional working from the relevant product information. ## Why this decides which size to buy Because the limit is a period and not a count, buying more millilitres than will be used inside that period buys nothing. A 30 mL vial and a 10 mL vial have the same in-use window once opened — so the larger vial's better price per millilitre is only real if the volume is actually used before the window closes. This is the reason a multi-vial pack of a smaller presentation frequently beats one large vial on true cost, and it is worked through with the numbers in vial sizes and pack quantities (https://ausbacsupply.com/blog/bac-water-vial-sizes-and-pack-quantities). Aus BAC Supply stocks 10 mL, 20 mL and 30 mL presentations (https://ausbacsupply.com/shop/bacteriostatic-water) for exactly that reason. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Entry, handling, in-use limits and disposal must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: How many times can you use a multi-dose vial of bacteriostatic water? A: No maximum number of entries is printed on the vial or stated in the product information. What limits the vial is the in-use period that starts at first entry and the printed expiry on the sealed vial, whichever falls first, together with an inspection before every entry. Q: Does a multi-dose label mean the vial stays sterile after opening? A: No. It means the presentation is formulated and tested for repeated access — for bacteriostatic water, because 0.9% benzyl alcohol has been added as a preservative. A bacteriostatic agent inhibits the growth of most common bacteria; it does not sterilise the contents or reverse a contamination event. Q: Can I re-enter a single-dose sterile water vial if there is liquid left? A: No. A preservative-free single-dose presentation is intended for one withdrawal and is then discarded. There is no bacteriostatic agent holding growth in check between entries, so remaining volume is not a reason to re-enter it. Q: Is it safer to make fewer entries into the vial? A: Each entry is an opportunity to introduce contamination and to core the stopper — punching a fragment of rubber into the solution. Fewer entries reduce both, but they do not extend the in-use period, which runs on the calendar from the first entry regardless. Q: What is coring? A: Coring is a needle punching out a fragment of a vial's rubber stopper rather than parting it cleanly, leaving that fragment in the solution. It becomes more likely with repeated entries through the same point on a stopper. A vial with visible particulate is discarded rather than filtered or decanted. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) --- ### How to Read a Bacteriostatic Water Vial Label URL: https://ausbacsupply.com/blog/how-to-read-a-bacteriostatic-water-vial-label Published: 2026-08-18 · Topic: Basics Every line on a bacteriostatic water label is there for a reason — composition per millilitre, dose designation, lot, expiry, manufacturer and the USP claim. What each one tells you, and which discrepancies mean don't use the vial. Key takeaways: - A genuine label states the product name, the volume, the composition per millilitre, the dose designation, a lot number, an expiry date and the manufacturer. - “Bacteriostatic” and “multiple-dose” both appear on the label of a preserved presentation — a vial claiming one without the other is worth a second look. - The lot number and expiry are printed by the manufacturer, not applied by the seller; a sticker over either is a reason to stop. - “USP” after the product name is a claim of conformity to a published monograph, not decoration. - The supplied product information, not the carton and not this page, governs use. A vial label is not packaging copy. Every line on it is a specific claim the manufacturer is making about the contents, and reading it properly is the single best check available to a buyer — before purchase and again on arrival. This guide takes a bacteriostatic water label element by element. ## Why the label is the specification Product photography, a shop listing and a seller's description are all downstream of the label. The label travels with the vial, was applied by the manufacturer, and is the only description of the contents that arrives inside the sealed presentation. Where a listing and a label disagree, the label is correct and the listing is wrong. That is also why Aus BAC Supply supplies original factory-sealed presentations without decanting, repackaging or relabelling (https://ausbacsupply.com/about). Once a solution has been moved out of the container whose label describes it, no label on the new container is a manufacturer's claim about what is in it. ## The product name Expect the full compendial name, not an abbreviation: **Bacteriostatic Water for Injection USP**. Three parts are doing work there. - **Bacteriostatic** — the presentation contains a bacteriostatic preservative. Its absence means preservative-free, which is a different product entirely. - **Water for Injection** — the grade of water, a manufactured and released quality, not simply purified water. - **USP** — a claim of conformity to the United States Pharmacopeia monograph of that name. It commits the manufacturer to a published specification covering identity, sterility, preservative content, particulate and a controlled pH range. What USP means on a vial (https://ausbacsupply.com/blog/what-does-usp-mean-on-a-vial) covers what that standard actually requires. A label reading only "bacteriostatic water" with no grade and no monograph reference is making a much smaller claim than one that names both. ## The composition statement This is the line that distinguishes the product from every other clear liquid in a similar vial. It states what is in each millilitre, and for a bacteriostatic water presentation it names **benzyl alcohol at 0.9% (9 mg/mL)**, added as a preservative. On a bacteriostatic sodium chloride (https://ausbacsupply.com/product/bacteriostatic-sodium-chloride-30ml) label the same statement additionally names 0.9% sodium chloride — which is the entire difference between the two products, and it is visible right there on the vial. Preservative-free sterile water (https://ausbacsupply.com/product/sterile-water) names no preservative at all, because there isn't one. If you are checking that you have been sent what you ordered, this line settles it faster than anything else on the vial. Many labels also carry a statement about pH, sometimes noting that it may have been adjusted during manufacture. A controlled pH range is part of the monograph specification rather than a variable the manufacturer is free to leave open. ## The dose designation Labels state whether the presentation is **multiple-dose** (also written multi-dose) or **single-dose**. This is a manufacturer statement about repeated access, not a suggestion, and it tracks the composition statement directly: a preserved presentation is designated multiple-dose, a preservative-free one single-dose. The designation says nothing about how many withdrawals are permitted, because no count is printed anywhere — the limit is a period, which how many times you can use a multi-dose vial (https://ausbacsupply.com/blog/how-many-times-can-you-use-a-multi-dose-vial) works through. ## Lot number and expiry Two manufacturer-applied identifiers, and the pair most worth examining physically: - The **lot (batch) number** identifies the production run. It is what makes a vial traceable back to a specific batch, and it is why a recall can reach the vials it needs to reach. - The **expiry date** applies to the unopened, factory-sealed vial stored as labelled. It is not extended by anything, and it is not the same as the in-use period that begins at first entry. Both are printed or embossed by the manufacturer as part of the presentation. A sticker applied over either, a hand-written date, or a lot number that has been obscured are all reasons to stop and query the vial rather than use it. ## Manufacturer and volume The label names the manufacturer and states the fill volume — 10 mL, 20 mL, 30 mL. Volume is worth reading rather than assuming, because presentations of the same product in different sizes look almost identical at a glance and the labels are the only quick way to tell them apart. On who actually manufactures these presentations, who makes BAC water (https://ausbacsupply.com/blog/who-makes-bac-water) covers the ground. ## Storage and cautionary statements Expect a storage instruction — typically controlled room temperature, away from direct light and out of freezing conditions — and cautionary statements setting out that the product is a diluent and not for direct administration. Neither is fine print. The storage line is the condition under which the printed expiry means anything at all; how to store bacteriostatic water (https://ausbacsupply.com/blog/how-to-store-bacteriostatic-water) covers what it requires in an Australian climate. ## What a wrong label looks like Read as a checklist, the failure modes are consistent: - **No lot or no expiry.** Not a labelling shortcut — a manufacturer presentation carries both. - **A seller's label over the manufacturer's.** Whatever is underneath, the vial can no longer be identified from its own label. - **Composition that doesn't match the name.** A vial named bacteriostatic with no preservative in the composition statement, or the reverse. - **A broken or missing flip-off seal.** The presentation is no longer factory-sealed, whatever the label says. - **Print quality that varies across the label.** Manufacturer labels are printed in one process; mixed fonts and alignment are worth a second look. The wider version of this check — seller, sourcing and what to ask before ordering — is in where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia). This guide explains how to read a label. It does not authorise use: these products are diluents or solvents, not ready-to-administer medicines, and preparation and use must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What should a bacteriostatic water label say? A: The full product name including the grade and any monograph reference, a composition statement naming benzyl alcohol at 0.9% (9 mg/mL), the fill volume, a multiple-dose designation, a manufacturer-applied lot number and expiry date, the manufacturer's name, and storage and cautionary statements. Q: How can I tell bacteriostatic water from sterile water by the label? A: The composition statement. A bacteriostatic presentation names benzyl alcohol 0.9% (9 mg/mL) as a preservative and is designated multiple-dose; a preservative-free sterile water presentation names no preservative and is designated single-dose. Q: Is a sticker over the expiry date a problem? A: Yes. The lot number and expiry are applied by the manufacturer as part of the presentation. Anything covering, replacing or hand-writing over either means the vial can no longer be identified from its own label, and it should be queried with the seller rather than used. Q: What does USP after the product name mean? A: It is a claim that the product conforms to the United States Pharmacopeia monograph of that name — a published specification covering identity, sterility, preservative content, particulate limits and a controlled pH range. It is a specific commitment, not a marketing term. Q: Does the expiry date on the vial apply after it is opened? A: No. The printed expiry applies to the unopened vial stored as labelled. Once the stopper is first entered, a separate and much shorter in-use period begins, and whichever date falls first ends the vial's usable life. Sources: - Bacteriostatic Water for Injection USP — manufacturer product information — Pfizer (Hospira) (https://labeling.pfizer.com/) - United States Pharmacopeia — National Formulary (USP–NF) — United States Pharmacopeial Convention --- ### What Does USP Mean on a Vial? URL: https://ausbacsupply.com/blog/what-does-usp-mean-on-a-vial Published: 2026-08-18 · Topic: Chemistry USP after a product name is a conformity claim, not decoration. What the United States Pharmacopeia is, what a monograph actually fixes, and how a USP claim differs from “pharmaceutical grade”, BP and lab grade. Key takeaways: - USP stands for United States Pharmacopeia — a standards body that publishes monographs, not a manufacturer or a regulator. - “Bacteriostatic Water for Injection USP” is a claim that the product conforms to the published monograph of that name. - The monograph fixes identity, sterility, preservative content, particulate limits, container requirements and a controlled pH range. - “Pharmaceutical grade” and “medical grade” are descriptions; USP names a document anyone can look up. - A monograph claim is about the product's specification. It is not a substitute for the supplied product information. Three letters after a product name — **Bacteriostatic Water for Injection USP** — and they are the most substantive thing on the label. Unlike "premium", "pharmaceutical grade" or "medical grade", USP points at a specific published document that anyone can go and read. ## What USP is USP stands for the **United States Pharmacopeia**, a scientific standards organisation that publishes quality specifications for medicines and their ingredients. It does not manufacture anything and it is not a regulator; it writes the standards, and regulators and manufacturers reference them. The specifications are published as **monographs** — one per substance or preparation. A monograph is a public specification: it says what the product must be, and how to test whether a given batch is. ## What a monograph fixes A monograph for a sterile injectable preparation covers considerably more than composition: - **Identity** — what the substance is, and the tests that confirm it. - **Strength and content** — including how much preservative is present, within limits rather than approximately. - **Sterility** — a release requirement, tested rather than asserted. - **Particulate matter** — specified limits on visible and sub-visible particles. - **pH** — a controlled range, not merely "around neutral". - **Packaging and container closure** — what the product is filled into, and the integrity that container must have. - **Labelling** — what must appear on the label, which is why compliant labels look so consistent between manufacturers. > **The point of a monograph is that it is not the manufacturer's own recipe.** Two manufacturers producing the same monograph product are producing against the same published specification, which is what makes the products comparable at all. ## The bacteriostatic water monograph For Bacteriostatic Water for Injection, the specification covers sterile water for injection with a suitable antimicrobial preservative added — in the presentations sold here, **benzyl alcohol at 0.9% (9 mg/mL)** — along with the sterility, particulate, container and controlled pH requirements above. The preservative concentration is the part worth dwelling on. It is not a nominal figure: the amount of benzyl alcohol present is a specified, tested quantity, because it is what makes repeated access to the container possible in the first place. How the 0.9% preservative works (https://ausbacsupply.com/blog/benzyl-alcohol-in-bacteriostatic-water) covers the mechanism. ## USP vs "pharmaceutical grade" vs lab grade These phrases are not variations on a theme, and only one of them refers to a document. | Term | What it refers to | Verifiable? | | --- | --- | --- | | **USP** | Conformity to a specific published monograph | Yes — the monograph is public | | **Pharmaceutical grade** | A general description of intended quality | Only if it names a standard | | **Medical grade** | A general description of intended use | Only if it names a standard | | **Laboratory / reagent grade** | Purity suited to laboratory work | Varies by supplier specification | None of the looser terms is dishonest by itself — a product genuinely made to a high specification may well be described as pharmaceutical grade. The difference is that "USP" tells you *which* specification, and the others leave you to ask. ## What about BP and Ph. Eur.? USP is not the only pharmacopoeia. The **British Pharmacopoeia (BP)** and the **European Pharmacopoeia (Ph. Eur.)** publish their own monographs, and a vial may reference one of those instead depending on where and for which market it was manufactured. A label reading "BP" rather than "USP" is making the equivalent kind of claim against a different published standard. What matters when reading a label is that *some* standard is named, and that the name is a real one. How to read a vial label (https://ausbacsupply.com/blog/how-to-read-a-bacteriostatic-water-vial-label) puts the monograph reference in context with the rest of the printing. ## What a USP claim is not A monograph claim describes the product's specification. It says nothing about whether a given use is appropriate, and it does not replace the product information supplied with the vial. It is also not a marketing endorsement, an approval, or a statement about a particular market's regulatory status — those are separate matters entirely. Aus BAC Supply supplies original factory-sealed manufacturer presentations, and the monograph reference on any vial is the manufacturer's, printed as part of the label. Products supplied are diluents or solvents, not ready-to-administer medicines; use must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: What does USP stand for on a vial? A: United States Pharmacopeia — a scientific standards organisation that publishes quality specifications called monographs. USP after a product name is a claim that the product conforms to the monograph of that name. Q: Is USP the same as pharmaceutical grade? A: No. USP names a specific published document that fixes identity, sterility, preservative content, particulate limits, container requirements and pH range. “Pharmaceutical grade” is a general description of intended quality and only means something specific if it names the standard it is describing. Q: What does the bacteriostatic water monograph require? A: Sterile water for injection with a suitable antimicrobial preservative added — 0.9% (9 mg/mL) benzyl alcohol in the presentations sold here — together with specified sterility, particulate, container closure and controlled pH requirements, and the labelling the monograph sets out. Q: Is a BP vial different from a USP vial? A: It references a different pharmacopoeia. The British Pharmacopoeia publishes its own monographs, so a BP label makes the equivalent kind of conformity claim against a different published standard rather than a lesser one. Q: Does USP mean the product is approved for use in Australia? A: No. A monograph claim describes the product's specification, not its regulatory status in any particular market, and it does not replace the product information supplied with the vial. Sources: - United States Pharmacopeia — National Formulary (USP–NF) — United States Pharmacopeial Convention - Bacteriostatic Water for Injection — USP monograph — United States Pharmacopeial Convention --- ### Alcohol Swabs: Why 70% Isopropyl and Not 100% URL: https://ausbacsupply.com/blog/alcohol-swabs-70-percent-isopropyl-explained Published: 2026-08-18 · Topic: Lab Supplies The strongest alcohol is not the most effective antiseptic. Why 70% isopropyl is the standard concentration on a swab sachet, what the remaining 30% water is for, and what the foil wrapper is protecting. Key takeaways: - 70% isopropyl alcohol is the standard antiseptic concentration — and it outperforms higher concentrations, which is the counter-intuitive part. - The water in a 70% solution is doing work: it lets alcohol penetrate the cell and slows evaporation enough to give contact time. - Near-pure alcohol coagulates the outer cell layer so fast it seals the cell against further penetration. - Swabs are individually foil-wrapped because an opened sachet dries out and stops being a 70% solution. - An alcohol swab reduces surface contamination. It does not sterilise, and it is not a substitute for anything else. Pick up a sachet of alcohol swabs and it will say **70% isopropyl alcohol**. The obvious question is why it isn't 100% — and the answer is that a near-pure alcohol solution is measurably *worse* at the job, for a reason that is worth understanding. This is a specification guide, not a usage guide. ## The question the sachet raises Isopropyl alcohol (isopropanol, IPA) is an antiseptic. Intuition says more of an active ingredient does more, and for most of what is in a first-aid drawer intuition is right. For alcohol it is not: 70% is the concentration standardised on, and going higher gives up the mechanism that makes it work. ## What the water is for Alcohol kills bacteria by **denaturing their proteins** — unfolding the structures a cell depends on to function. Protein denaturation by alcohol needs water present. In a solution that is nearly all alcohol, there is not enough water for the reaction to proceed properly, so the process is slower and less complete. The remaining 30% is not dilution in the sense of watering something down. It is the second reagent. ## Why stronger works worse The more striking effect is what near-pure alcohol does on contact. It denatures and coagulates the proteins of the **outer cell layer almost instantly** — forming a coagulated shell that impedes further penetration of alcohol into the cell. The outside of the organism is damaged and the inside is protected by the damage. A 70% solution acts more gradually, which allows it to penetrate the cell rather than sealing itself out of it. Slower, in this instance, is the point. > **The counter-intuitive result:** 70% isopropyl is the effective concentration, not a cost-saving dilution of a better product. A 99% solution is the right choice for some tasks — drying electronics, removing residues — and the wrong one for antisepsis. ## Contact time and evaporation Denaturation is not instantaneous, so the solution has to stay in place long enough to act. Alcohol evaporates quickly, and the higher the alcohol fraction, the quicker it goes. Water evaporates more slowly, so a 70% solution stays wet on a surface longer than a 99% one — extending the contact time in which anything is happening at all. This is why a wiped surface is left to dry rather than dried off. The wet interval is the working part; wiping it away ends the process early. ## Why every swab is foil-wrapped The concentration only holds while the sachet is sealed. Foil is used rather than film because alcohol is volatile and will migrate through many plastics over time — an inadequately sealed swab loses alcohol to evaporation and stops being a 70% solution long before it looks dry. It also explains why swabs are packed individually rather than as a tub of pre-soaked pads. Each sachet is opened at the point of use, and one opened sachet is one swab's worth of exposure rather than the whole supply's. A swab that has dried out is discarded, not re-wetted. ## What a swab does not do An alcohol swab reduces contamination on the surface it is applied to. It does not sterilise that surface, it does not act on anything it does not physically reach, and it does nothing about the condition of what is underneath. On a vial stopper this matters directly: wiping the stopper of a multi-dose vial addresses the surface being pierced, and it has no bearing at all on the vial's in-use period (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last) or on whether the solution inside is still clear and free of particulate (https://ausbacsupply.com/blog/cloudy-bacteriostatic-water). Nor does it change how many times a stopper can be entered — that is governed by the dates, as how many times you can use a multi-dose vial (https://ausbacsupply.com/blog/how-many-times-can-you-use-a-multi-dose-vial) sets out. ## What we supply Aus BAC Supply stocks alcohol swabs in 20-packs (https://ausbacsupply.com/product/alcohol-swabs-20pk) as a laboratory consumable, individually foil-wrapped, alongside insulin syringes (https://ausbacsupply.com/product/syringes-insulin-20pk) and the vials themselves. The exact specification for the pack we carry is on the product page rather than summarised here, so what you read is the specification of the item in stock. We supply these as lab consumables and do not advise on selection or use. Whether a task calls for a swab, and whether the task is appropriate at all, is a matter for a qualified professional working from the relevant product information. Products supplied by Aus BAC Supply are not for human or veterinary therapeutic use. #### FAQ Q: Why are alcohol swabs 70% and not 100%? A: Because alcohol denatures bacterial proteins and that reaction needs water present. Near-pure alcohol also coagulates the outer cell layer so quickly that it impedes further penetration into the cell, and it evaporates faster, cutting contact time. 70% is the effective concentration, not a dilution. Q: Is 99% isopropyl alcohol stronger than 70%? A: It contains more alcohol, but it is less effective as an antiseptic. Higher concentrations are used for tasks like drying electronics or removing residues, where the mechanism that matters is solvency and rapid evaporation rather than protein denaturation. Q: Why is each swab wrapped separately in foil? A: Alcohol is volatile and migrates through many plastics, so a foil seal is what keeps the pad at 70% until it is opened. Individual wrapping also means opening one sachet exposes one swab rather than a whole supply. A dried-out swab is discarded. Q: Does an alcohol swab sterilise a surface? A: No. It reduces contamination on the surface it physically reaches. It does not sterilise, does not act on anything it does not touch, and has no bearing on the condition of the solution inside a vial or on that vial's in-use period. Q: Should a wiped surface be dried off? A: The wet interval is when the alcohol is acting, so a wiped surface is allowed to dry rather than being dried off. Beyond that general point about how the chemistry works, technique is a matter for a qualified professional — we supply swabs as lab consumables and do not advise on their use. Sources: - United States Pharmacopeia — National Formulary (USP–NF) — United States Pharmacopeial Convention --- ### Bacteriostatic Water Prices in Australia: What Drives the Cost URL: https://ausbacsupply.com/blog/bacteriostatic-water-price-australia Published: 2026-08-18 · Topic: Buying Guide What you actually pay for bacteriostatic water in Australia comes down to four things: vial volume, pack quantity, shipping, and whether the vial is an original manufacturer presentation. How to compare sellers on landed cost per usable millilitre. Key takeaways: - Price per millilitre falls as vial size and pack quantity rise — but only counts for volume actually used inside the in-use period. - Shipping is often the largest single variable: a small order can pay more in freight than the difference between two sellers' vial prices. - A price well under the market is usually explained by what is missing — a repackaged vial, no lot or expiry, or an overseas shipment. - Compare landed cost per usable millilitre, not sticker price per vial. - Current prices are listed on the shop and product pages; this guide covers what moves them. Bacteriostatic water is a low-cost product with a surprisingly wide spread of advertised prices, and most of the spread is explained by four variables rather than by one seller being greedier than another. Current prices are on the shop pages (https://ausbacsupply.com/shop); this guide is about what moves them, and how to work out which of two listings is actually cheaper. ## Four things set the price - **Vial volume** — 10 mL, 20 mL or 30 mL. - **Pack quantity** — a single vial, a multi-vial pack, or a manufacturer tray. - **Shipping** — including whether the order clears a free-shipping threshold. - **The presentation itself** — an original factory-sealed manufacturer vial, or something else. Only the last of these is a quality question. The first three are arithmetic, and they are where most buyers overpay. ## Vial volume and price per mL A larger vial costs more in absolute terms and less per millilitre. The fill is a small fraction of what goes into the product — the vial, the stopper, the seal, the sterile filling operation and the release testing are much the same for 10 mL as for 30 mL — so the price does not scale with volume, and price per millilitre falls as the vial gets bigger. That makes the largest vial look like the obvious buy, and it is the most common way to spend more than necessary. A vial's in-use period (https://ausbacsupply.com/blog/how-long-does-bacteriostatic-water-last) starts at first entry and runs on the calendar regardless of how much is left. Volume unused when that period ends was never a saving — it is simply volume paid for and discarded. > **The right figure is cost per *usable* millilitre.** A 30 mL vial at a better price per mL is worse value than a 10 mL vial if only 10 mL gets used inside the window. ## Pack quantity Multi-vial packs are where the genuine saving usually sits, precisely because they do not have the problem above. Five separate 10 mL vials are five separate sealed presentations, each with its own in-use period starting whenever that vial is first entered — so the pack discount is real and the volume is not on a shared clock. Aus BAC Supply prices packs down as quantity rises (https://ausbacsupply.com/shop/bacteriostatic-water), and vial sizes and pack quantities (https://ausbacsupply.com/blog/bac-water-vial-sizes-and-pack-quantities) works through which combination lands cheapest for a given amount of actual use. ## Shipping, the hidden variable On an order this size, freight is frequently the largest single line after the goods, and comparing two sellers on vial price alone can invert the result. A cheaper vial plus flat-rate freight regularly totals more than a slightly dearer vial that ships free. Aus BAC Supply ships free Australia-wide over **$150**, with tracked standard and express options below that and a flat express upgrade on orders that already qualify for free shipping. Orders dispatch from Melbourne on the same business day when placed before 2pm. The practical consequence: an order sitting just under a free-shipping threshold is usually cheaper *in total* if it is brought up over it, and worth checking before you check out. ## What a cheap vial is missing A price meaningfully below the market is worth investigating rather than celebrating, because on a product with this cost structure there is not much margin to give away. The usual explanations: - **It is not an original presentation.** Solution decanted into another container is no longer described by a manufacturer's label, and nothing about it can be verified from the vial. - **No lot or expiry.** Both are manufacturer-applied and both should be readable — how to read a vial label (https://ausbacsupply.com/blog/how-to-read-a-bacteriostatic-water-vial-label) covers what else should be printed. - **It ships from overseas.** The listed price may be genuine while the delivered cost, the transit time and the recourse if something arrives wrong are all different from a domestic order. - **The seller cannot be identified.** No business details, no returns process, no address — which is the cheapest corner of all to cut. Where to buy bacteriostatic water in Australia (https://ausbacsupply.com/blog/where-to-buy-bacteriostatic-water-australia) has the full checklist, and it applies to any seller, this one included. ## How to compare two sellers properly Four steps, in order: - Decide how many millilitres will realistically be used inside one in-use period. - For each seller, find the vial and pack combination that covers that — not the cheapest per millilitre in the abstract. - Add freight for that exact order, including any free-shipping threshold. - Divide the total by the millilitres you will actually use. That last number is the price. It is frequently not the seller with the lowest number on the product tile. These products are diluents or solvents, not ready-to-administer medicines. Never inject them by themselves or self-administer. Use must follow the supplied manufacturer product information under qualified healthcare-professional direction. #### FAQ Q: How much does bacteriostatic water cost in Australia? A: It depends on vial volume, pack quantity and shipping. Current prices for every size and pack are listed on the Aus BAC Supply shop and product pages; the figure worth comparing between sellers is landed cost per millilitre you will actually use, not the price on the product tile. Q: Is a bigger vial better value? A: Per millilitre, yes — the vial, stopper, seal, filling and testing cost much the same at 10 mL as at 30 mL, so price does not scale with volume. But the in-use period runs on the calendar from first entry, so volume left unused when it ends was paid for and discarded. Q: Do multi-vial packs actually save money? A: Usually, and for a better reason than a bulk discount: each vial in a pack is its own sealed presentation with its own in-use period starting when that vial is first entered. The discount is real and the volume is not on a shared clock. Q: Why is shipping worth checking before comparing prices? A: On an order this size, freight is often the largest line after the goods. A cheaper vial plus flat-rate freight frequently totals more than a slightly dearer vial that ships free, so an order just under a free-shipping threshold is often cheaper in total once brought over it. Q: Why would one seller be much cheaper than another? A: Usually because something is missing — a decanted or repackaged vial rather than an original presentation, no readable lot or expiry, an overseas shipment, or a seller with no identifiable business details or returns process. On a product with this cost structure there is little margin to give away. --- ## Glossary - **Bacteriostatic water**: Sterile water containing 0.9% (9 mg/mL) benzyl alcohol, a bacteriostatic preservative that inhibits the growth of most common bacteria. The preservative allows a sealed multi-dose vial to be accessed repeatedly. Use only as specified in the manufacturer product information and under qualified healthcare-professional direction. - **Sterile water**: Purified water that has been filtered to remove microorganisms and sealed under sterile conditions, with no preservative added. Because there is no bacteriostatic agent, a sterile water vial is intended for a single withdrawal and should not be re-entered. - **Bacteriostatic sodium chloride (saline)**: An isotonic 0.9% sodium chloride (saline) solution with benzyl alcohol added as a bacteriostatic preservative, allowing repeated access to a sealed multi-dose vial. Follow the supplied product's manufacturer information for its intended application. - **Benzyl alcohol**: A colourless aromatic alcohol used as a preservative in certain medical solutions. At 0.9% (9 mg/mL) it acts as a bacteriostatic agent, holding bacterial growth in check after a vial's seal is broken. - **Bacteriostatic**: Describes an agent that inhibits the growth and reproduction of bacteria without necessarily killing them — from the Greek stasis, a standstill. In bacteriostatic water and bacteriostatic saline, 0.9% benzyl alcohol performs this role, holding bacterial growth in check between entries into a multi-dose vial. A bacteriostatic preservative does not guarantee sterility after opening and does not replace the supplied handling requirements. - **Bactericidal**: Describes an agent that kills bacteria outright, rather than merely halting their growth. The distinction matters when reading labels: the preservative in bacteriostatic water is bacteriostatic, not bactericidal, so it suppresses growth between vial entries but cannot make a contaminated solution safe. - **Reconstitution**: The process of dissolving or diluting a substance in a liquid such as bacteriostatic or sterile water. Product selection, preparation and use must follow the supplied manufacturer information under qualified healthcare-professional direction. - **Multi-dose vial**: A manufacturer-labelled vial presentation intended for more than one withdrawal when handled as specified in its product information by qualified personnel. No maximum number of withdrawals is printed: what limits the vial is the in-use period and the printed expiry, whichever falls first. - **In-use period**: The fixed period during which a multi-dose vial may continue to be used, running from the moment its stopper is first entered. It is separate from, and much shorter than, the expiry date printed on the sealed vial; whichever falls first ends the vial's usable life. - **Clarity**: Freedom from visible haze, cloudiness or suspended particulate. Bacteriostatic water is expected to be a clear, colourless solution, and a departure from that appearance is treated as an inspection failure rather than a cosmetic issue. - **Cloudiness (haze)**: The visible scattering of light by particles that are not dissolved — undissolved solid, a precipitate, aggregated material or contamination. A true solution is optically clear because dissolved molecules are too small to scatter visible light, so haze is direct evidence that something in the container is out of solution. Where material is expected to be clear and is not, it is not used. - **Precipitation**: The coming out of solution of a substance that was previously dissolved, appearing as haze, crystals or a deposit. It is commonly driven by a change in pH, concentration, temperature or ionic strength. - **Particulate matter**: Undissolved foreign or intrinsic material visible in a solution — flakes, fibres, crystals or fragments. Injectable presentations are released against specified particulate limits, and a vial with visible particulate is discarded rather than filtered or decanted. - **Coring**: The punching out of a fragment of a vial's rubber stopper by a needle, rather than the stopper parting cleanly, leaving the fragment in the solution. It becomes more likely with repeated entries into the same point on a stopper, which is why a multi-dose vial is inspected before every entry. - **Isotonic**: A solution with the same effective osmotic concentration as a reference solution. Sodium chloride 0.9% is commonly described as isotonic saline. - **Nonpyrogenic**: Free of fever-inducing substances, principally bacterial endotoxin. It is a distinct release requirement from sterility: a solution can be sterile and still contain pyrogens left behind by organisms killed during processing. - **USP monograph**: The published United States Pharmacopeia standard a compendial product is manufactured and released against, covering identity, sterility, preservative content, particulate limits, container closure integrity and a controlled pH range. Bacteriostatic Water for Injection USP is released against that specification rather than a manufacturer's private recipe. - **Medical grade**: A product manufactured and labelled for medical use under the quality requirements applicable to its manufacturer presentation. Aus BAC Supply supplies original, factory-sealed manufacturer products without alteration. ## Reference & policies - [FAQ](https://ausbacsupply.com/faq) - [Glossary](https://ausbacsupply.com/glossary) - [About](https://ausbacsupply.com/about) - [Contact](https://ausbacsupply.com/contact) - [Shipping & Returns](https://ausbacsupply.com/returns) - [Privacy Policy](https://ausbacsupply.com/privacy) - [Terms of Service](https://ausbacsupply.com/terms)