Really tested it...

I live in an area where the water is full of minerals and is not safe to even drink. When I shower I've had more than one occasion of my highlights turning green and my hair was always just so dry. So I gave this a shot. Most filters that are supposed to last 6 months or so were only lasting 5 weeks. This one is I believe at the 3 month mark and still running strong. No green hair, no dry strands or dry skin. Definitely worth the buy.