Seems to be making a difference, my scalp is less itchy and my skin is happier. Followed the instructions, found these useful and understood that you had to run the water through to get rid of the blackness before using. Has not hampered our water pressure. It didn't leak at all until I unscrewed the head of our shower, think I just need to screw it back on properly. Overall I will continue to use this and buy the replacement filters. I live near Bath and having lived in Cornwall for years my skin was really suffering with the return to hard water and this filter is definatly making my life easier. I have been using this for 3 months now.