calcs.homes
calcs.homes
Enter your pool volume and pump's flow rate (check the pump label or spec sheet) to find how many hours a day to run it.
Estimate only — split run time across the day (e.g. morning and evening) for more even circulation.
Turnover time is pool volume divided by flow rate in gallons per minute, converted to hours (flow rate × 60 minutes). Recommended run time then multiplies that turnover figure by a usage factor: 1× for normal maintenance, 1.5× for heavy bather load or hot weather, or 2× when recovering from algae or cloudy water.
Turnover time — how long it takes to circulate a volume equal to the whole pool once — is the standard benchmark pool professionals use because it ties directly to how often the filter can remove debris and how evenly chemicals distribute. Raising the usage factor during heavy use or an algae recovery compensates for water needing to pass through the filter more than once a day to stay clear; splitting the total into morning and evening sessions often circulates more evenly than one long block.
Most pools need 6-8 hours a day to fully turn over — enter your specific pool volume and pump flow rate above for an exact number.
A variable-speed pump running longer at a lower speed usually uses less electricity than a single-speed pump running short and fast, while still hitting full turnover — see the pool pump electricity cost calculator to compare.