Seeking help: Why is the free chlorine in the circulating water sampled at the return water main?
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This post was last edited by hesonchang214 on 2009-8-22 01:03. Why is sampling for free chlorine in the circulating water taken at the return water main?
This ensures that the added oxidizing biocides circulate through the system, thereby guaranteeing that all of them come into contact with the components within the system.
It is at the end of the pipeline network; since the chloride level here meets the standards, it is certain that the standards are also met in other areas