The company i am considering is Morehead Pools and i'm not sure of the volume it's about 8-1/2 to 9 feet at the deep end i believe, and i measured the length and width before i am having a hard time remembering what i came up with i want to say the estimate was a around 22,000 gallons.. i will measure again when i get home. There is an old sand filter in place already i'm not sure how operational it is but i can't imagine much being able to go wrong with it besides needing new sand. The valve on top is a little stiff i guess before i replace it i will take it apart and inspect it.