I am lazy and don't want to measure my new pool. It's an odd twisted peanut shape. Maybe I would like to measure it but I don't really know how. So I took the chlorine level before and after adding a known quantity and fiddled with the "gallons" value over at poolcalculator.com until its recommendation matched reality.

I added 121 oz of 8.25% bleach to my 3.5ppm and ended up with 10.5ppm. Apparently that works perfectly on an 11,500 gallon pool. Absolutely precisely in line with the measurements and additions.

Did I accurately measure my pool water volume? Or is there some gotcha that makes that invalid?

I just bought this house. We closed a little faster than we thought and now I'm trying to get a handle on this pool. The CYA is stupidly high, so the ~10ppm is probably where I want to be for now anyways. (I think)

I kind of just dumped the first jug of bleach in to see what would happen. Until now the previous owner had been paying someone a lot of money every month to, from what I can tell, let the CYA run out of control. It's more than 100 but less than 200 I think. I am going to try the dilution test tomorrow. We are in the middle of a mandatory water conservation order, so I don't plan on any partial draining.