We used to have really hard water with strong chlorine smell. The shower curtains, faucets .. anything that came in contact with the water got build up. Then I purchased two of these. I put them side by side. The first one I put in a cheaper membrane filter, to filter out sediments. The second one I use the company’s more expensive filter to filter out the chemicals. With this filter system, I can’t smell chlorine anymore and the new clear shower curtain shows no sign of water build up.