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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.
Inground vs. Above Ground Pool Size. Believe it or not, an above ground pool can be every bit as large, if not larger, than an inground pool. For example, a 30â round above ground pool actually has more area than a 18x36 inground pool. Notwithstanding, with an above ground youâre generally limited to one uniform depth throughout.