I used to have a 24ft AG. I had a full-rated 1/2hp inground pump and it was plenty big enough. In fact, I am still using that pump on my current pool which is a 27ft AG. I have it paired with a 300lb. sand filter. (I went with an inground pump because they are made better. One of my co-moderators who knows a lot about pumps picked it out for me when I needed a replacement years ago.)