Hi, leave it some time and ...

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Hi,

leave it some time and concentration of chlorine automaticaly drop down. Speed of concentration decreasing is directly influenced by temperature and concentration of oxidable compounds (Mn2+, Fe2+, organic matter etc.). Dosing of any other chemicals (thiosulphate, Vitamic C, ...) is used in sampling procedure NOT in normal operation.  If you want to improve speed of de-chlorination, it is possible to use aeration.

Ladislav