I bought the rainshow'r shower filter three years ago, because after showering I had a dry itchy skin. The filter works very well, my dry itchy skin was completely gone after 2 weeks. My skin even felt nice. In addition, my skin always looked better. The improvements I have noticed are due to the filter, since my skin will itch again as soon as it is time to replace my filter. I recommend this filter to everyone! I have already purchased the Replacement Cartridge 3 times, I am also very satisfied with that. The filter is easy to disassemble and replace.