The average 21-foot round pool carries 13,500 gallons of water at a depth of 48 inches. According to Robelle, a 21-foot circular pool with a 52-inch depth stores 14,500 gallons.
The formula for calculating water capacity for round or oval pools is average depth x length x breadth x 5.9 when all measurements are measured in feet. A square or rectangular pool’s formula is average depth x length x breadth x 7.5. Owners may estimate the exact amount and type of chemicals needed to clean the pool and maintain the pH balance by accurately calculating water capacity.
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