Question 1

What is bacteriostatic water?

Accepted Answer

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, a preservative that inhibits bacterial growth. The preservative allows a sealed multi-dose vial to be accessed multiple times under proper aseptic laboratory handling, unlike preservative-free sterile water. Halo Bac is supplied for in-vitro laboratory research use only.

Question 2

What is BAC water?

Accepted Answer

BAC water is the common abbreviation for bacteriostatic water. The two terms refer to the same product: USP-grade sterile water preserved with 0.9% benzyl alcohol, intended for laboratory research use only.

Question 3

How is bacteriostatic water different from sterile water?

Accepted Answer

Standard sterile water contains no preservative and is intended for single use. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth and allows multiple withdrawals from the same sealed vial under aseptic conditions over an extended period.

Question 4

How long does bacteriostatic water last after opening?

Accepted Answer

Per USP guidance for multi-dose vials, opened bacteriostatic water is generally used within 28 days when stored and handled correctly under aseptic technique. After 28 days, sterility can no longer be assured. Unopened vials typically remain stable until the printed expiry date, often 2 to 3 years from manufacture.

Question 5

How should bacteriostatic water be stored?

Accepted Answer

Store unopened vials in a cool, dry place at controlled room temperature (15–30°C), away from direct light and extreme temperatures. Check packaging integrity before use; do not use vials with cracked glass or damaged seals.

Question 6

What grade is Halo Bac bacteriostatic water?

Accepted Answer

Halo Bac bacteriostatic water is USP-grade, sterile-filled in an ISO Class 7 cleanroom, preserved with 0.9% benzyl alcohol, and lab-tested for endotoxin and microbial purity. Supplied in sealed multi-dose vials for in-vitro laboratory research use only.

Question 7

What sizes are available?

Accepted Answer

Halo Bac offers 3ml and 10ml sealed multi-dose vials of the same USP-grade bacteriostatic water. Orders are dispatched within 24 hours.

Bacteriostatic water, answered.