What is the expected frequency of testing of High Purity Water systems, such as Purified Water with Endotoxin Control: daily, weekly, bi-weekly, monthly, etc., for point of use sampling?

Q7A does not specifically address frequency of testing of high purity water systems. The
frequency of testing for both endotoxin and microbial testing of water systems will vary from one
company to another. A company should assess what is most practical for their particular
operation. The frequency of testing for both microbial and endotoxin attributes will depend upon
the design of the water system, the quality of the source water and other factors.