Ive always preferred to run my pump during the day. I havent proven it helps any, but my pool has sun on it from 7am to about 5pm, so Id rather keep everything circulating during the really hot/sunny times to avoid the water growing stuff because its stagnant.
I dont start right at 7am, and I let the pump run until a little into the evening hours, because its better to add chlorine when its not sunny out so I do that after the sun goes down and then the pump runs for a couple hours to circulate the new chlorine.
-Chris
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