Pool Pump Run Time Calculator by Turnover Hours
Find how many hours to run your pump each day for one full turnover, from your pool's gallons, pump flow, and turnover target.
daily run = 1 × 6.7 = 6.7 h
How it works
A pool stays clear when all its water passes through the filter regularly. One full pass is a **turnover**, and the time for one turnover is simply your pool volume divided by the pump's flow rate. At 50 gallons per minute a pump moves 3,000 gallons an hour, so a 20,000 gallon pool turns over once in about 6.7 hours.
Most residential pools aim for at least one turnover a day; one to two is common. Multiply the turnover time by your target and you have the daily run time. You do not have to run it all at once — splitting the schedule into a couple of blocks is fine, since it is the total hours that count.
Use your pump's real flow at your plumbing, not its nameplate maximum — head loss from pipes and the filter lowers it. A variable-speed pump changes the whole picture: running slower moves less water per minute but uses far less energy, so longer hours at low speed usually beat short bursts at high speed.
turnover = 20,000 ÷ (50 × 60) = 6.7 h
daily run = 1 × 6.7 = 6.7 h