Positive control is absolutely required for water analysis. For media
efficacy, you have to perform this. Here is mentioned that if you use
same lot of media, that is not required, but you have to ensure that
your media storage condition is not effected on their nutrient
properties. If you can do that, you have to have recorded properly to
show your auditor.
Md. Mainul Hoque
Asst. Manager, Microbiology
LABAID Pharmaceutical Limited
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