I'm just opening my pool for this season and can't remember how many gallons I have... (this is only my second year) I just measured and it's a 24' round AG and although the depth changes I'm gessing average about 4 ft deep. (about 3 1/2 on the outside and about 4 1/2 in the middle) I just googled on how to figure it out and I'm coming up with 13,593. Just checking if this sounds good before I go starting to add stuff. My cover caved in this winter and now I'm starting with a SWAMP! Wish me luck!