1 HP pump vs 1.5 HP pump for above-ground pools: 1 HP is the sweet spot for most pools

A 1 HP pump works for most above-ground pools up to 24 feet, while 1.5 HP is usually overkill and can cause problems like liner suction and wasted electricity. The key difference is that 1 HP gives enough flow to turn over the water in 8-10 hours without stressing the system. Only go with 1.5 HP if you have a pool over 30 feet or a high-flow sand filter.