Also Known As: Rate of Flow
If a pump is too large, the energy costs can climb. If a pump is too small, the water may not be filtered properly.
Flow rate depends on the size of the pool and the turnover rate or the desired rate that the pools water is circulated. An online calculator can find the flow rate, or it can be calculated by hand very easily. First, find the capacity of the pool (length x width x average depth), by multiplying the volume of the pool (in feet) by 7.5 (the number of gallons in a cubic foot). The result is the number of gallons of water that the pool can hold. Divide this value by the desired turnover rate 6 hours, 8 hours or 10 hours. Finally, divide the answer by 60 to find the minimum flow rate per minute. Use a chart to find a pump that matches the flow rate of the pool.
A flow meter will show the flow rate of the pump at any given time. If the pump is the proper size, a flow rate that is either too low or too high could indicate a problem with the pump or filtering system.