Buyer guide

Bacteriostatic water vs. sterile water

Both arrive sterile. Only one survives the first puncture. Here is the practical difference for research procurement.

The short answer

Sterile water is free of living organisms. Bacteriostatic water is sterile water that also contains 0.9% benzyl alcohol so it stays that way after the vial has been opened. The difference is not purity at release — it is what happens after the first puncture.

Side by side

• —Sterile water: single-use. Once opened, discard; no preservative system to protect the remainder.
• —Bacteriostatic water: multi-dose. The preservative suppresses bacterial growth so one vial supports repeated draws across research sessions.
• —Both are sterile at release; only one is designed for a punctured vial to remain in service.

Which one a wholesale buyer orders

If your workflow draws from a vial more than once, bacteriostatic format is the standard choice and the reason distributors stock it. If your protocol consumes the entire vial at once, preservative-free sterile water is appropriate — but that is a single-use pattern, and buying it in multi-dose vials buys you nothing.

How Bac Water Co. ships it

Our vials are 10 mL and 30 mL, USP-grade, with 0.9% benzyl alcohol. Every production lot is independently tested — sterility, endotoxin, pH, and benzyl alcohol concentration — and ships with its Certificate of Analysis.