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To get the square feet we need to first get the units (feet and inches in this case) the same. Since you're still going to have to buy an additional bag of salt to cover the extra 6 inches (Since 3 feet = 36 inches and you have 42 inches) we might as well round it to the nearest foot. 42 is closer to 48 inches which is 4 feet.

14 feet x 48 inches/12 inches/feet = 14 feet x 4 feet = 56 feet²

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Q: How much salt for a pool 14 feet x 42inches?
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