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assuming you have a pentair 2.3 21" 51-1/2" 50 24,000 225 lbs.20 grit silica sand If on the other hand you mean the amout of sand needed to cover the floor of a 21' round pool to a depth of 2", the answer is 3 to 4 tons.

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โˆ™ 2007-03-24 07:49:43
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Q: How much sand is needed for a 21' diameter above ground pool?
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