The number of gallons of water in a pool varies dramatically depending on its size. Between 18,000 and 20,000 gallons of water are held in the average in-ground backyard pool.
A swimming pool of Olympic size carries roughly 660,000 gallons of water, whereas a Junior Olympic pool stores around 280,000 gallons. The average American family would take over six years to use the quantity of water required to fill an Olympic pool.
To figure out how many gallons of water a swimming pool holds, multiply the length by the width by the pool’s average depth.
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