I never had been able to get a "good" number for the volume of my pool. The PB came up with 1 number, I used an online calculator and it came up with another number.
I've been doing most of the chemical balance based on 25,000 Gal. And most of the time it works out fine.
I had a very low FC level today, so I brought it up to shock levels. Here are the steps:
Basic Chlorine test was barely yellow.
Add about 1.5 Gallons of HASA 12%
FC tested at 6.5 about 3 hours later -> HASA Liquidator was running as normal
Added 1 gallon of HASA 12%
FC tested at 16.5 about 3 hours later -> HASA Liquidator was running as normal
If I use the final FC and the Middle FC and reverse the calculation on the Pool Calculator to 1 Gallon I get a volume of 12,500 Gallons of water.
I don't see how this is possible.
What am I missing?