Testing for Combined Chlorine in Pool Water All good chlorine test kits and pool test strips allow you to determine free chlorine as well as total chlorine. Combined chlorine is calculated from these values as follows: combined chlorine = total chlorine - free chlorine The combined chlorine value should never exceed 50% of the free chlorine value and should ideally be as close to zero as possible. Some cheaper test kits that use liquid reagents (drops) offer one value for the chlorine test. If the reagent bottle is marked "OTO" then you are only testing total chlorine and should consider a better test kit. Destroying Combined Chlorine Compounds A shock treatment using either chlorine or a non-chlorine sanitizer will ensure the destruction of the nitrogen compound combined with the chlorine. The pungent smell disappears and the free chlorine level goes up providing complete sanitization of the pool water. 1. HOCl + NH3 = NH2Cl + H2O hypochlorous acid + ammonia = monochloramine + water 2. NH2Cl + NH3 = NHCl2 + H2O monochloramine + ammonia = dichloramine + water 3. NHCl2 + NH3 = NCl3 + H2O dichloramine + ammonia = trichloramine + water
Posted on: Sun, 29 Sep 2013 00:48:05 +0000
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