That will depend on how deep you want the water to be.
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48,000 gallons of water
18 x 36 ______ 108 540 ______ 648 gallons 18x36 = 648 square feet. Assume depth of pool 5 feet filled to brim, total volume 18x36x5 = 3240 cubic feet. 3240 multiplied by 6.22883 = 20181 UK gallons (rounded) 3240 multiplied by 7.48052 = 24237 US gallons (rounded)
2 gallons
5,287.7 gallons of water.
You will need a maximum of 11,230 gallons of water.