The amount of HP the pool pump needs depends on the size and shape of your pool, and how it is used. Here’s how to calculate the amount of pool pump horsepower. Fill in this example with your own swimming pool’s gallons. And remember, the pool volume (gallons) multiplied by two equals daily gallons required for a 12 hour turn.
EX: For a pool that holds 15,000 gallons of water.
15,000 gallons x 2 turnovers/day= 30,000 gallons/day
Circulate 30,000 gallons of water every 24 hours. How many gallons per minute, or GPM, is this?
30,000 gallons/ 24 hours = 1,250 gallons/hour
1,250 gallons per hour/ 60 minutes = 20.8 gallons per minute
A 15,000 gallon swimming pool needs about 20 GPM output if you want to run it 24 hours a day. Use this example and plug in your own pool’s gallons to determine if a swimming pool pump that runs on 1.5 HP fits your needs. These swimming pool pumps that use 1.5 HP are a smart investment for larger installations.