I had found old paper work stating my pool was 16,500 gallons.
When I did the fresh fill after the new liner was installed a week ago, I
first did a 5 gallon bucket test. It filled the bucket in 25 seconds (good pressure!)
With that math I determined (with the fill time) the pool was actually closer to 13,000 gallons.
one thing I know for sure, when I added the very first gallon of 8.25% bleach, it raised FC exactly 4.5 ppm.
I added another gallon when it got time to add more and again 4.5 ppm.
According to pool math that would make the pool 19,000 gallons....I find that hard to believe.
I put in an email to plastimayd to see if they can tell me the precise volume since it was
a custom made liner. The installer wasn't sure they could tell me which seems odd.