Hello from new pool owner

Welcome! Glad to have you!

I also have a 20x40 pool, but mine is only 27K gallons. You may want to check your volume. There is a rough calculator at the bottom on the PoolMath page.

According to poolmath it is correct. I got the number from a pool contractor that came to the house. Deep end is 10'. Shallow is 3.5'

what are your depths on your pool?
 

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