What is the standard size of a bottle used in a BAC-T sample?

The standard size for a bottle used in a BAC-T (Bacteriological Test) sample is indeed 100 mL. This size is typically used to ensure that an adequate volume of water is collected for testing, while also allowing for the concentration of bacteria within the sample.

Using a 100 mL bottle strikes a balance, as it is large enough to provide a representative sample without being excessive. This specific volume helps avoid contamination and ensures that the sample can be analyzed accurately for microbial presence, which is crucial for maintaining water safety and quality.

While other sizes are mentioned, they are not standard for BAC-T sampling procedures. A 50 mL bottle may not provide enough volume for comprehensive testing, while larger bottles, such as those that hold 250 mL or 500 mL, could complicate handling and increase the risk of contamination, making them less practical for this specific use.