Here’s a ready-to-paste HTML article on sizing a pool pump and filter for an above-ground pool, with a featured snippet, short sections, one data table, FAQs, and the internal link woven in.
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Match the pump to your pool’s gallon count and an 8-hour turnover target, then choose a filter rated for at least that flow in GPM.
For the full breakdown, see our best Above Ground Pool Filter And Pump guide.
A pump that’s too big for its filter is the most expensive mistake in above-ground pool gear. Force 60 gallons per minute through a sand filter rated for 40, and the water crosses the sand bed too fast to shed its dirt — tank pressure climbs, the pool turns cloudy, and the motor runs harder for a worse result.
Three numbers settle how to size a pool pump and filter for an above ground pool: total gallons, target turnover time, and the filter’s maximum flow rating. Horsepower stickers matter far less than most shoppers assume.
How Much Flow Does Your Pool Actually Need?
Your pool wants its full volume pushed through the filter in roughly 8 hours, so the flow you need is total gallons divided by 8 — then divided by 60 for gallons per minute, since pumps and filters are both rated in GPM.
Volume comes first, because every other number hangs on it. Measure depth to the water line rather than the rim, then use the formula for your pool’s shape: