Weight of 1 US Gallon of water = approx. 8.35 lb
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330lbs
Sand is heavier than water.
When filled to 80% water capacity, as recommended, the pool holds approximately: 10'x30" = 915 gal 12'x30" = 1,353 gal 12'x36" = 1,722 gal 15'x36" = 2,561 gal 15'x42" = 3,110 gal 16'x42" = 3,896 gal 18'x36" = 3,735 gal 18'x42" = 4,814 gal 18'x48" = 5,593 gal 24'x48" = 10,103 gal per intex pools site
About 334 pounds for 40 US gallons.
4 US gallons = 32 US pints