What a fantastic product. I bought this for my mum and dad as they live in a hard water area and their taps were scaled and kettles kept getting really scaled up. It was really easy to install and within days the shower head was clearing up, the taps were clearing up and so was the kettle. This is just with one little plumber on the cold mains in. I will fit another on the hot water side as they have a cold storage tank. Very impressed and would recommend.