Dechlorinating backwash water prior to discharge (TN38)

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.

Whether discharge water consent requires the removal of free chlorine depends on three factors – the free chlorine concentration, the volume of water discharged and how long it stands prior to discharge.

The method of dechlorination may depend on base water characteristics and the ease of compliance with the required discharge consent. This technical note deals with these issues.


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