pi/4 x diameter squared times height in feet times 7.48 gallons per cubic foot
3.14/4 x20x20x4 = 1256 cubic feet
1256*7.48 = 9395 gallons
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About 2,794 gallons of water.
About 7,645 gallons.
48*18=864
to calculate the content of the pool go to this link