Factor #1 The Pool’s Required Flow Rate
The pump must have a minimum flow rate in GPM (gallons per minute) that will allow it to move all the water through the filter within a given amount of time. The size and usage of the pool is the first item to consider in order to determine what the minimum flow rate is.
Factor #2 The Pool’s Features
Your pool may have certain features that require more flow in order to be effective. For instance, spa jets need a certain amount of flow in order to be effective. Some automatic pool sweeps increase the flow requirements of the pump.
Factor #3 The Plumbing of the Pool
The plumbing of your pool is only designed to carry so much water per minute. If you exceed this amount, you will be wasting energy and can end up damaging the pump.
Factor #4 Pool Equipment
The pump should be properly matched to the filter. An oversized pool pump can damage the filter internals or force the water through the filter at such a high rate that the filtration is no longer effective.
Factor #5 Pump Options
There are many variations in how a pump operates and performs. Learn how to select a pump that best suites the needs of your pool and pocketbook.