What Is Bac Water? Bacteriostatic Water Buyer Guide (Australia)

What is bac water? Bacteriostatic water (“bac water”) is sterile water that contains 0.9% benzyl alcohol, an additive that stops bacteria from growing so the same vial can be used multiple times over several weeks. In peptide research it is the standard liquid used to reconstitute (dissolve) lyophilised peptide powder into a usable solution. Bondi Labs stocks bacteriostatic water in Australia with same-day dispatch before 12pm AEST.

Bacteriostatic water vs sterile water vs distilled water

• Bacteriostatic water: sterile water + 0.9% benzyl alcohol. The preservative means a multi-use vial stays usable for around 28 days once opened, which is why it is preferred for reconstituting peptides used over time.
• Sterile water for injection: sterile but has no preservative, so it is single-use once opened.
• Distilled water: purified but not necessarily sterile and not suitable for reconstitution work.

Can you buy bac water at Chemist Warehouse?

Bacteriostatic water is not reliably available off the shelf at general Australian pharmacies such as Chemist Warehouse, and availability varies. Bondi Labs keeps it in stock specifically as a research supply, packaged in sealed 10mL vials and dispatched same day from within Australia. You can view current pricing on the bacteriostatic water product page.

How bac water is used to reconstitute peptides

1. Draw the required volume of bacteriostatic water using a 1mL research syringe.
2. Add it slowly against the inside wall of the peptide vial, not directly onto the powder, to protect the peptide.
3. Let the powder dissolve on its own or swirl gently. Do not shake vigorously.
4. Store the reconstituted solution refrigerated at 2–8°C and avoid repeated freeze–thaw cycles.

Use the reconstitution calculator to work out exactly how much bac water to add for your target concentration.

Frequently asked questions

Where can I buy bac water in Australia?
Bondi Labs stocks bacteriostatic water and ships Australia-wide with same-day dispatch before 12pm AEST.

How long does bac water last once opened?
The benzyl alcohol preservative typically keeps a vial usable for around 28 days when stored correctly and kept refrigerated.

What size vials do you stock?
Sealed 10mL vials, ideal for reconstituting multiple research peptides.

Shop bacteriostatic water at Bondi Labs →

Disclaimer: Supplied for laboratory research use only. Not a therapeutic good and not intended to diagnose, treat, cure or prevent any disease. Not for human or veterinary use.