Microbial limit

Hi,

How can we calculate the alarm limit and action limit of microbe in purified water? I have microbial data of 12 months but I don’t know which formula should be used.

Thank you.

Generally, Action limit should be the limit specified in the pharmacopoeial monograph or the specification. And alert limit shuld be based on the data you have gathered for 12 months. Alert limit is always stringent that Action limit.