I have a intex above ground 15 x 4ft pool, i used a salt water filter for the first 3 years and this year it has quit working so I have went to chlorine. I have the intex filter that came with the pool. I fought with it for a week going back and forth to the pool store and I finally have everything stable (for today). I found this forum and now feel that I might learn more from it here then the pool store.