A lot of discussion regarding minimizing the pump run time by setting the SWCG at 100% which of course is a good objective. Many also like to have longer run times for debris removal. I prefer to have my pump run from before my wife would head down there until 8pm or so. We like to see a clean water surface as much as possible. I live in a pretty clean environment but the minute after turn off the pump, the water begins to get speckled with bugs, pollen, etc. Mind you, our dogs are hairy and shed so on dog swim days, the longer run times work well for hair removal as well.