Depends on how big it is
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18,000
A 20 foot round pool has a radius of 3.2 feet. So the pool has a volume of pi*r2*h = 101.86 cubic ft approx.
How many gallons of water for a 15'x30' swimming pool?
We can't be sure - we need another dimension. If the Pool is 20 feet long by 48 feet wide, we need to know how deep it is - a 2 foot deep pool will not hold as much as a 10 foot deep pool. If the pool is not a uniform depth, there are formulae used to determin how much water the pool will hold. Try calling Anthony. Or Esther Williams.
It depends on how long the pool is.