The pool is 20*48*4 = 3840 cubic feet. And 1 cubic foot is about 7.48 gallons, so total the pool can hold 28723.2 gallons.
About 18,402 gallons.
This pool holds a maximum of about 10,360 gallons of water.
15228.5 US gallons 12680.4 Imperial gallonswhen it is filled to 4 and a half feet.
3400 gal