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What is Combined Chlorine (Chloramine)? Combined chlorine, also collectively called chloramines, is created by the reaction of free chlorine with contaminates in the pool, often from the ammonia and nitrogen byproducts producing from swimmers and microorganisms.
Many lawn products contain both nitrogen and ammonia and phosphates, all very bad for pools, can raise your chlorine demand, and encourage algae growth. Chloramines, or combined chlorine smell bad, they are eye and skin irritants, and they get in the way of free chlorine trying to do it's job. When a pool smells strongly of Chlorine, what smells is not free available chlorine, but Chloramines . When testing for Free and Total Chlorine with a DPD or other capable pool test kit, the level of combined chlorine molecules in your pool can be detected. The formula is quite simple.