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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.
The pool would be 20' wide by 30'long and hold about 25000 gallons of water. Bryan Franks I live on a hillside with a basement cut into the hill, at the end of my house I was wanting to pour an above ground concrete pool which would be about 4' tall on the up hill side then slope down to about 7' tall at the bottom end.