Desperate NEWBIE needs help on Purchasing a new filter

[The Raddish]

I have a AG round 24'x 4' deep. I believe that the volume is just under 14000 gallons. (If somebody could verify that I would appreciate it.)

To determine your volume, use the following formula:

Depth Ratio = actual depth (inches) / 48 (inches)

Volume = π * (Depth Ratio * 4) * radius^2 (cubic feet)

Then multiply your volume by 6.22883288 for Imperial gallons (used by BleachCalc) or 7.48051945 for US gallons.

I have a 24' x 52" AGP with a water depth of 46.5". Plugged into the formula gives me about 13100 US gallons. Yours should be less, since you have a 48" pool. I'd imagine that your depth is around 42". Using that, you would have about 11800 US gallons.