h2o volume of my pool?

[Bruce_B]

I get 19,791 gallons.

15 squared * pi * depth of 3.75 feet * 7.47.

If the actual water depth was 52" it would be 22,693 gallons.

Actually that should be * 7.48.

So at 45" you have 19,817 and at 52" you would have 22,724. That's probably why the manual shows 23,000.