I used to have a handheld shower with a sediment filter that turned black way too quickly, which made me worry about my tap water quality. I was looking for something more effective and longer-lasting, and decided to try the Coolang ACF filter. At first, it leaked a bit during installation, but after following the seller's advice to not overtighten, it was fine. After two weeks of use, my skin and hair feel more hydrated, and the NSF certification and long filter life give me peace of mind.