What is the purpose of residual chlorine strips?

Residual chlorine strips are specifically designed to assess the amount of chlorine that remains in the water after the disinfection process has taken place. This measurement is crucial for several reasons. Firstly, it indicates whether enough chlorine has been used to effectively kill harmful microorganisms, ensuring water safety. Secondly, residual chlorine serves as a protective measure against recontamination in the distribution system, maintaining water quality from point of treatment to the point of use.

Monitoring residual chlorine levels helps operators determine if the disinfection process was effective and if the chlorine levels are within safe and acceptable ranges for consumption. Therefore, the option that states the purpose of residual chlorine strips is to test for residual chlorine after disinfection aligns perfectly with their primary function in water quality management. This understanding is essential for maintaining safe drinking water and effective water treatment practices.