What does combined chlorine in pool water mean in practice?
It forms when chlorine reacts with ammonia and nitrogen compounds introduced by bathers and the environment.
When does it matter?
An elevated result is associated with chloramine odour, irritation and incomplete oxidation of contamination.
Which solutions are related to it?
Measure free and total chlorine by DPD, correct pH, ventilation and filtration and perform controlled breakpoint oxidation.