5 Things to Know About Above-Ground Pool Pump Flow Rates

Aim for 1,500 to 2,500 GPH For most above-ground pools with 1.5-inch hose filters, this range is the sweet spot for proper water turnover.

Lower flow invites algae If the pump is too weak, the water doesn’t turn over enough, giving algae a head start.

Higher flow risks damage Going much above 2,500 GPH can blow out hose connections or starve the pump due to friction loss in a 1.5-inch hose.

Stock pumps are fine for small pools Most stock above-ground pumps in this hose size run 1,000-1,500 GPH, which works for pools under 15 feet.

Match flow to pool size for 8-hour turnover For a 20-foot or larger pool, aim for the higher end of the range. Use an online pool volume calculator to match the pump’s rated flow to your pool’s gallonage for one full turnover in about 8 hours.