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You need to figure the volume of the pool: width x length x height in feet, then multiply by 7.5 to get gallons. Assuming your ends are round, yours would be something like 15 x 27 (for the middle) plus 7.5^2 x pi for the circular ends, all times 4 feet for the depth, or a total of 2327 cubic feet. Multiply by 7.5 to get 17451 gallons.

Now, if you want an 8 hour turnover (recommended) then you'd want 2181 gal/hour, or 36 gpm. Add in a safety factor (partially clogged filter, etc.) and somewhere around 50 gpm should be fine. Don't overdo it, though, too much volume is not good either.

A: More simply put would be more like 12 t 18 hrs depending upon use or bather load - - how many people, dogs etc in pool for what length of time - 8 hrs would be the minimum if the pool were not used.

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volume= Radius squared X height X Pi (3.14159) R=7.5' (1/2 of a 15' diameter) 7.5 X 7.5=56.25 H=3.5' 56.25 X 3.5 X 3.14159 = 618.5 cubic feet 1 cubic foot = 7.48 gallons 618.5 X 7.48 = 4,626.38 gallons

Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.

When filled to 80% water capacity, as recommended, the pool holds approximately:

10'x30" = 915 gal

12'x30" = 1,353 gal

12'x36" = 1,722 gal

15'x36" = 2,561 gal

15'x42" = 3,110 gal

16'x42" = 3,896 gal

18'x36" = 3,735 gal

18'x42" = 4,814 gal

18'x48" = 5,593 gal

24'x48" = 10,103 gal

Volume = pi * (15/2)^2 * 42/12 = 618.5 cubic feet * 7.4805 gallon/cubic foot = 4,627 gallons.

Cliff Laubstein

If the pool is 5 feet deep all around, the total volume will be 18,513 gallons of water.

4646.25 gallons

About 4,646 gallons.

Q: How many gallons of water does it take to fill a 15 foot by 42 inches pool?

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