I have a 4'x16' round (5000gal) metal frame intex pool.The filter for that does nothing. At least your getting some help. My pool dealers around me told me to buy metal out and put it in. Well lets say it did nothing, and they didn't have any other advice. I ended up dumping my pool, and am now starting from scratch. Called HTH chemicals for their reccomendation. they said to fill, dump their metal out in pool with chlorine level at 0. Wait 4-5 days then it's ok to add chlorine. Also, I was reading online how to make a hose filter to try and catch most of the iron. I'll let you know how that goes.