I was checking my pool, I tested and my FC was 0.5 so the pool calculator told me for 16000 Gal. (what I thought I had) I needed to add 123 oz of chlorine to get m to 8 FC (CYA of 50). So I did that and 3-4 hours later I checked and it was at 7... I messed with the numbers and it looks like my pool may be 18500 gal... because if I had it set at 18500 and set it so i was at 0.5 FC and wanted to get to 7 it shows add 123 oz (if you are following me)...

I am looking for a way to back up my findings... I have a pool that I think is 16x33 rectangle with rounded corners, and steps at both ends... its a Foxx Sport pool that is about 3.5 on both sides to 5.5 in the middle (need to get my tape out to be 100% sure on measurements). I cant find a calculator to show me average depth with two shallow ends... does that sound like 18500 to you?

thanks for any thoughts...

only pic on hand: