So I've been running along for 2 years thinking my pool is 18K gallons or so. Each time I use the pool calculator to determine how much salt to add it is telling me to add almost 2x as much as really needed to reach the target level. The first year I ended up adding too much due to this.
For example, this past weekend my salt level was 2500ppm and this was verified with a salt test strip and same reading on my Aquapure. The pool calculator said to add 78 pounds of salt to get to 3000ppm. Instead I added only a 40 pound bag and I ended up hitting 3000ppm right on the button, again verified with test strip and Aquapure. So should I assume my pool is only 10K gallons? (Pool calc says a 40 pound salt addition will move a 10K pool from 2500 to 3000).
For comparison when I add CYA & MA it is much closer in calculations, still a little overshot but not by much. Just trying to see if I can trust the salt and my pool is smaller or not. The size of the pool is a bit unknown since it was built by previous home owner. I do have the records and it seems like closer to 20K gallons of water was the fill.