I don't bother with the GPM calculations, mainly because the water in your pool is always mixing, so if you run it long enough to turn your pool water over once, I really don't think you do since you may have turned some of the water over twice, while you didn't turn some other water over any.
I run from sunup, to sundown, make maximum use of my solar gain and try to retain that gain by not running the pump over night.
I tend to take my solar cover off at 5:00 pm when I get home, and put it back on at 9:00 or 10:00 pm or whenever we're done swimming, usually I'll connect the vac during that time. reasons I keep the cover on while I'm at work are:
1. less bird crap
2. less dirt - it lands on the cover and blows off again for the most part.
3. Most importantly for me - little to no evaporation
So far it's worked great, never have algae issues and the water is always clear.
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