I installed this after my pressure tank over a year ago. Before installation my wife refused to do laundry at our house and was taking loads up to the laundry mat a couple times a week. We also had stains in our sinks, toilets, bath tub, dog dishes, etc. Lab results indicate that total iron was detected in a sample of our untreated water at concentration of 1.63 mg/L. After installing, we removed these stains and they have not returned. Also seems to have reduced clogging in the pipe that drains my kitchen sink, which was getting clogged with a white/yellow precipitate about once every other month. I have not touched the filter since installation and iron has not been an issue. I wish I had installed this sooner.