Well we have iron in our well water. I have an intex ultra 16x48 pool, new this year. I have used quite a few tricks here from this site which have helped a little. Bought Metal Free didn't work that well. Our water is clear but looks green. So my husband thinks the saltwater intex unit is the way to go, I don't so I need some feed back. Would just buying a new sand filter system help our iron problem. Thanks so much for everyones help