Introduction
In laboratory research, precision and sterility are everything. Among the many solutions available to researchers, bacteriostatic water plays an essential role in dilution, reconstitution, and safe sample preparation. But what exactly is it, how does it differ from sterile water, and why is it widely used across labs in Europe?
This guide provides a clear overview for lab professionals and researchers. (Important: All products discussed here are sold for Research Use Only (RUO), not for human or veterinary use.)
What is Bacteriostatic Water?
Bacteriostatic water is sterile water that contains 0.9% benzyl alcohol. This small addition of benzyl alcohol acts as a preservative, preventing the growth of bacteria in the solution after opening.
- Composition: 99.1% sterile water + 0.9% benzyl alcohol
- Purpose: Used for dilution and reconstitution of lab substances
- Benefit: Longer shelf life after first use compared to sterile water alone
How is it Different from Sterile Water?
While both solutions are sterile, there are key differences:
| Feature | Sterile Water | Bacteriostatic Water |
| Additives | None | 0.9% Benzyl Alcohol |
| Shelf Life After Opening | Short (single-use recommended) | Longer (benzyl alcohol prevents bacterial growth) |
| Typical Use | Single-use reconstitution, cell culture | Multi-use reconstitution, dilution, assays |
Common Laboratory Applications
Bacteriostatic water is frequently used in:
- Reconstitution of powders – many lyophilized substances require rehydration before use.
- Dilution of samples – preparing accurate concentrations for assays or tests.
- Storage buffer – maintaining integrity of certain lab preparations.
- General research workflows – where sterility and multi-use access are important.
Storage & Handling Best Practices
- Keep sealed vials at room temperature away from direct light.
- Once opened, always reseal properly with the original stopper.
- Discard if solution appears cloudy or contaminated.
- Follow your lab’s internal protocols for shelf life and disposal.
Compliance Reminder
At Herbilabs, all bacteriostatic water is sold strictly for Research Use Only (RUO). It is not for human or veterinary injection, treatment, or medical use.
Conclusion & Next Steps
Bacteriostatic water is a trusted solution for labs that need a sterile, multi-use diluent with extended shelf stability. By understanding its properties and correct handling, researchers can improve reliability and efficiency in their workflows.
👉 Explore our sterile bacteriostatic water vials and kits — shipped across Europe with fast delivery.
