Chlorine test in the water

is used as a primary disinfectant because of its effectiveness in killing potentially harmful organisms. It forms hypochlorous acid in the pool water. The effectiveness of this is influenced by the other chemicals in the pool, primarily pH and the amount of bather waste.

Using DPD reagents in tablet form is the easiest way to test using DPD. There are four main DPD tablets that can be used when measuring chlorine or alternative disinfectants (such as bromine and ozone).

DPD 1 measures free available chlorine
DPD 2 (use with DPD 1) measures combined chlorine
DPD 3 (use with DPD 1) measures total chlorine
DPD 4 measures the total available chlorine

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