I took a three stage filter and this two stage filter to create a five stage system. It was a waste of money. The filter was only good enough to remove chlorine. From where I know this. I bought this device and a water tester. The water tester shows approx. 145 ppm directly from the tap, after five filtration steps it was approx. 125 ppm. The WATT system is not what it used to be, the valves are mostly made of plastic and carry a CA warning that the product may contain carcinogens. Hey you could be like me and the system and check it out for yourself if you don't believe me. There is a much better system on the internet.
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