I have had a Watts Premier reverse osmosis unit for 4 years now. Instead of blindly changing it after 2 years, I bought a TDS meter and tested it with different filter changes every 6 months. About a month into my annual filter change my water started to taste bad and I went from 94% out to 50% out. I bought one of these from Revain and it's back up to 92-94%. You need to flush multiple tanks to see the best TDS and bounce rates. We have very hard water, 900 ppm. With the old filter it was 470 ppm, after changing the filter and washing it once it was 270 ppm and after washing it twice it was 70 ppm. . I am very happy with it. Btw I totaled the cost of the filters over 4 years and it came out to be $0.24 a day to run this before the membrane was replaced and $0.29 after that. Its worth it.
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