Understanding breakpoint chlorination (TN36)

PWTAG Technical notes are updates or new material for the standards and guidance given in the PWTG book, Swimming Pool Water and the PWTAG Code of practice and should be read in association with these publications.

The purpose of chlorination of the swimming/spa pool water is twofold:

  1. To kill bacteria and viruses likely to be harmful to bathers
  2. To breakdown nitrogenous bather pollutants associated with sweat and urine introduced into the water as a consequence of use. It is these pollutants which can cause stinging eyes and mal odours. These are primarily measured as ammoniacal nitrogen


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