Ideal turnover rate

Commercial spec, here, is 6 hour turnover to determine flow rate. That is what I have always designed to (even residential pools). Pipe diameters also come in play, but if you have existing plumbing it is what it is!
 
For residential pools there isn't any "official" spec on the number of turnovers your system should be capable of. In practice 3 turns in 24 hours is a common design goal, though anything from 2 to 6 turns in 24 hours is common enough. In practice, the fewer turnovers your system is capable of the more energy efficient the pump will be. I tend to aim for closer to 2 turnovers rather than 3 or more. Of course, the actual number depends on so many details that it is often safer to go a little high rather than risking being under 2 turns a day.

Normally you only run the pump for about one turnover a day, which means running it for 4 to 12 hours instead of running it for the full 24 hours each day.
 
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