The most widely accepted mattress size is the queen size which measures 60.times.80 inches. A queen size waterbed mattress which is 9 inches deep will hold approximately 187 gallons of water.
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how many a quarts of water hold
A 20 Gallon tank can hold up to 20 gallons of water.
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A 15 cubic foot tank will hold a maximum of about 112.2 gallons of water.
141.06 gallons