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The necessary size (or horsepower) of the pump can be determined by the following general rule-for above ground pools up to 24 ft round, use a 1 HP pump and for above ground pools over 24 ft round, use a 1.5 HP pump.
1 For example: A 24 feet (7.3 m) round above ground pool has approx 13,500 gallons (51,103.1 L). 2  A Hayward S166T Sand Filter has a 10hr turnover rate of 18,000 gallons (68,137.4 L) and would work well with this pool.