5 Reasons a Smaller Pool Pump Is Better Than a Big One

Most pools need a pump sized to turn over the water once every 8-12 hours. Calculate your pool’s volume in gallons (length x width x average depth x 7.5 for rectangles), divide by 480 minutes, then add 10-20% for head pressure.

A bigger pump costs more upfront and uses more electricity. It pushes water faster, but that can reduce filtration efficiency because water passes through the filter too quickly.

A properly sized pump runs longer but uses less peak power. This saves money and still keeps your pool clean.

Variable-speed pumps are the best choice. They let you run low speed for filtration and high speed for cleaning, giving you control over energy use.

Check your filter’s maximum flow rate before buying a pump. Anything larger than that is wasted money, especially with sand filters. Do not let a pool store sell you a 3 HP pump for a 15,000-gallon pool.