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A 21' pool that is 48" high should have 10,407 gallons of water (approx). To calculate the gallons in a round swimming pool use this formula: Length x length x average depth x 5.9 = gallons of pool So in your case 21 x 21 x 4 x 5.9 = 10,407 gallons

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โˆ™ 2008-05-02 23:19:52
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Q: How many gallons of water are in a pool that is 21ft round and 4 feet high above ground pool?
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