Easy to install, just screwed onto my shower pipe. No tools required. Not sure if it removes 100% of Chlorine as I still itch after some showers, but not nearly as badly as before I purchased this product. It definitely does filter the water to some extent as I no longer smell the heavy chlorine smell. The shower head spray feels good and evenly distributed with no loss of water pressure which is great. I think a bigger or longer filter would allow for more time to filter the water. The water passes through this filter so quickly that it's hard to believe that it filters the water 100%. It's still a great product and cheaper when compared to getting a full filtration system installed into your shower wall by a professional company. I give it 4 stars as it doesn't filter 100% of the chlorine and other chemicals I presume but definitely better than having no filter at all. I would say it filters about 70 - 80% of the chemicals and other rubbish in the water which is still a massive upgrade for me. Also not badly priced as it lasts about a year or so. Have only had it for a week and I am happy with this product so far.