AS5369:2023 stipulates that monthly testing for TVC should be conducted for the first 12 months of your system being installed. The Standard states that endotoxin testing should be conducted annually, with the frequency adjusted according to the test results.
Our recommendation is to adopt a rigorous water testing regime with monthly water testing for both TVC and Endotoxin for the first 12months. Based on the performance trends, adjust only the frequency of Endotoxin testing. Monthly TVC testing will help you to set the disinfection frequency. It is important to remember that disinfection of an incorrect design of RO unit may elevate Endotoxin level.
Read the following articles for further information
Effective CSSD Water Sampling for AS5369 Compliance
CSSD Water Test Methodology for AS5369:2023 Compliance