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About our company
Built to raise the standard of an industry that needed one.
BuyBacWaterUSA, Inc started with a simple frustration: inconsistent quality and zero transparency across suppliers. We set out to fix both — sourcing the purest raw materials, testing every batch through accredited labs, and putting the paperwork in your hands before you ever open a vial. Nothing compounded. Nothing compromised. Just authentic, lab-verified bacteriostatic water — done right, every single order.
Choose Your Size
Available in 3 mL and 10 mL multi-draw sterile vials.
$4.99
UltraBac Bacteriostatic Water 3 mL
The perfect entry-level trial size for precise, small-scale reagent reconstitution. Compact, sterile, and fully batch-certified for absolute testing accuracy.
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UltraBac Bacteriostatic Water 10 mL
Our most popular multi-draw volume balanced perfectly for routine laboratory protocols. Provides extended 28-day viability for ongoing research pipelines.
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Select your multi-pack configuration of
3 mL or 10 mL Bacteriostatic Water vials below.
Lab-Verified Authenticity
Verified for exact 0.9% benzyl alcohol concentration and sterility.
At BuyBacWaterUSA, we believe that research integrity starts with absolute transparency. Every single production lot of our UltraBac Bacteriostatic Water undergoes strict, independent third-party laboratory testing to verify exact compliance with premium standards. These comprehensive analysis reports validate a precise 0.9% benzyl alcohol concentration, confirm absolute sterility against microbial contaminants, and ensure optimal pH balance.
Read MoreUnderstand The Essentials
Know exactly what you're buying
· 01
What is Bacteriostatic Water?
Bacteriostatic Water is sterile USP-grade water containing 0.9% benzyl alcohol as a bacteriostatic preservative. It is commonly used in laboratory settings to dissolve or dilute powdered research compounds so they can be sampled multiple times from the same vial. The preservative helps inhibit bacterial growth after the vial has been opened, making it suitable for repeated laboratory use when handled according to established research protocols.
0.9% Benzyl Alcohol
Multiple Sampling Safe
Up to 28 days
· 02
Precautions of using BAC water
In laboratory scenarios, bacteriostatic water requires strict precautions to avoid ruining research data and biological samples. It must never be introduced into cell cultures or enzymatic assays, as the 0.9% benzyl alcohol preservative kills living cells and denatures delicate proteins. Researchers must also exclude it from analytical testing like HPLC or UV spectroscopy because the alcohol molecule absorbs light and causes severe data interference. Finally, the vial must be discarded exactly 28 days after the first needle puncture due to preservative degradation, and the solution must be checked for chemical compatibility to ensure it does not precipitate the target research compound.
Sterile handling
Strict expiry
Inspect clarity
· 03
Research application of BAC Water
Bacteriostatic Water is commonly used in laboratory environments for the reconstitution and preservation of lyophilized research compounds, peptides, and proteins. The addition of 0.9% benzyl alcohol helps reduce bacterial growth, allowing researchers to sample multiple times from the same vial when handled using appropriate laboratory procedures.
This makes Bac Water suitable for:
• Reconstituting lyophilized research compounds
• Dissolving powdered peptides for laboratory analysis
• Preparing protein samples for research workflows
• Supporting repeated sampling from the same vial
• Maintaining laboratory consistency during research procedures
Product Specifications
Everything on the label
| Volume (mL) | 3 mL / 10 mL |
|---|---|
| Material | USP Type I borosilicate glass vial · butyl rubber stopper |
| Formulation | Water for base + 0.9% Benzyl Alcohol preservative |
| Packaging Standards | Sterile multi-dose vial · sealed, tamper-evident, aseptically filled |
| Storage Temperature | 20–25°C (68–77°F), away from direct light |
| Shelf Life | 24 months unopened · 28 days after first puncture |
| Quality Control / Lot Number | Batch-tracked · unique lot code · Certificate of Analysis per lot |
Compare Formulations
Product comparisons & formulations
| Property | BAC Water | Sterile Water |
|---|---|---|
| Preservative | 0.9% Benzyl Alcohol | None |
| Sterility | Sterile & bacteriostatic | Sterile only |
| Multi-sampling safe | Yes — up to 28 days | No — single use |
| Best for | Repeated reconstitution | One-time dilution |
| Property | BAC Water | Saline / Bacteriostatic Saline |
|---|---|---|
| Composition | Water + 0.9% benzyl alcohol | 0.9% sodium chloride (± preservative) |
| Contains salt (NaCl) | No | Yes |
| Preservative | Benzyl alcohol | Only in bacteriostatic saline |
| Multi-sampling safe | Yes — up to 28 days | Depends on preservative |
| Property | BAC Water | Distilled / Purified / WFI |
|---|---|---|
| USP grade | Yes (USP) | Only WFI; distilled/purified are not |
| Preservative | 0.9% Benzyl Alcohol | None |
| Sterile | Yes | WFI yes · distilled/purified not guaranteed |
| Multi-sampling safe | Yes — up to 28 days | No |
How it's made
Our manufacturing process
Multi-stage reverse osmosis
Source water is purified through successive RO membranes to strip out contaminants.
0.9% benzyl alcohol
The precise bacteriostatic concentration is blended under sterile conditions.
Aseptic vial filling
Vials are filled and sealed in a controlled cleanroom to protect sterility.
Lab test & COA
Every lot is third-party tested and issued a Certificate of Analysis before shipping.
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Answers
Frequently Asked Questions
What is Bacteriostatic (BAC) Water and how does it work?
Bacteriostatic Water is sterile USP-grade water containing 0.9% benzyl alcohol as a bacteriostatic preservative. It is commonly used in laboratory settings to dissolve or dilute powdered research compounds so they can be sampled multiple times from the same vial. The preservative helps inhibit bacterial growth after the vial has been opened, making it suitable for repeated laboratory use when handled according to established research protocols.
What ingredients are inside BAC water? (0.9% Benzyl Alcohol)
Just two components: a sterile water base and 0.9% benzyl alcohol acting as the bacteriostatic preservative. No salts, buffers, or other additives.
Is BAC water the same as sterile water or saline?
No. Sterile water has no preservative and is single-use once opened. Saline contains sodium chloride. BAC water contains 0.9% benzyl alcohol, making it safe for multi-sampling use.
How should unopened and opened BAC water be stored?
Store at controlled room temperature, 20–25°C (68–77°F), away from direct light. Unopened shelf life is up to 24 months; after first puncture, use within 28 days.
Can BAC water expire or become contaminated?
Yes. Discard after the printed expiry, after 28 days from first puncture, or immediately if the solution is cloudy, discolored, or the seal is compromised.
Where can I safely buy USP-grade BAC water online?
Buy from a supplier that publishes a per-lot Certificate of Analysis and ships in tamper-evident packaging. Every Buy Bac Water USA batch is USP-grade, lab-tested, and COA-verifiable by batch code.