Bacteriostatic Water in Canada: What to Know

Bacteriostatic water is a common item in any lab that works with lyophilised peptides and other freeze-dried research materials. Canadian researchers search for it regularly, so this guide covers what it is, how it differs from other waters, how to store it, and what to look for when sourcing it domestically.

What is bacteriostatic water?

Bacteriostatic Water for Injection, often shortened to BWFI, is sterile water that contains a small amount of a preservative, most commonly benzyl alcohol at around 0.9 percent. The preservative is what makes it bacteriostatic: it slows the growth of bacteria, which is why the same container can be accessed more than once rather than being a single-use item.

That is the key practical feature. Where a plain sterile ampoule is meant to be used once and discarded, bacteriostatic water is designed to be drawn from multiple times over a period before being replaced.

How it differs from other waters

The distinction matters because these waters are not interchangeable. Bacteriostatic water is the one specifically formulated to tolerate repeated access thanks to its preservative.

Why labs keep it on hand

Research peptides almost always ship as a lyophilised powder, which has to be brought into solution before it can be worked with. Bacteriostatic water is the standard diluent for that job because its preservative gives the resulting solution a more workable window than plain sterile water would. Its multi-access nature also makes it convenient when a single vial of powder is worked through gradually.

Storage and shelf life

• Keep it at controlled room temperature or refrigerated, out of direct light.
• Once a container is first accessed, it has a limited in-use window before it should be replaced, even though the preservative slows bacterial growth.
• Inspect before use: it should be clear and free of particles.
• Do not use a container past its labelled date or beyond its in-use period.

Sourcing bacteriostatic water in Canada

As with any lab supply, buying domestically saves you customs delays and long transit times. Look for a Canadian supplier that ships quickly and packs orders sensibly. When bacteriostatic water is part of your workflow, having it arrive alongside your other research supplies from a single domestic source keeps things simple.

Ordering from LYFE Science

LYFE Science is a Canadian supplier and ships coast to coast with Canada Post. Flat $25 shipping, free over $150, in neutral packaging. Orders paid before noon ET ship the same day, and most of Canada sees delivery in 1 to 3 business days. Payment is by Interac e-Transfer or crypto (BTC, ETH, SOL, USDC, USDT). We keep a focused catalogue of research materials and expand it over time.

Common questions

What makes water “bacteriostatic”?

The added preservative, usually benzyl alcohol, slows bacterial growth. That is what allows the same container to be accessed more than once instead of being a single-use item.

How is it different from sterile water?

Sterile water for injection contains no preservative and is intended for single use. Bacteriostatic water contains a preservative and is formulated to tolerate repeated access over a limited period.

How long does it last once opened?

Even with a preservative, an opened container has a limited in-use window and a labelled expiry. Keep it clear and particle-free, store it properly, and replace it once past its in-use period or its date.

Bacteriostatic water is not in our current lineup, but our shop carries the research peptides Canadian labs reach for, and the range keeps growing. Browse what is in stock and check back as we add more.

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