Evaporation and chlorine loss

May 25, 2007
766
Recent weather here has been hotter during the day and colder at night than pool temps, leading to pretty good evaporation. I was wondering if evaporation itself has any affect on chlorine loss.

It's generally recommended that when one shocks to make sure the FC level holds overnight. If evaporation causes chlorine loss, this could cause one to think they are losing something to organics and need to keep shocking when they really probably aren't.
 
No, evaporation does not cause chlorine loss. However, higher temperatures do increase the rate at which chlorine is lost. And wind can increase aeration which can somewhat increase chlorine loss. So some of the same factors that increase evaporation also increase chlorine loss.
 
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