I bought an Apera water tester to see if these filters work as advertised. I looked at the local water data and found it to be 290ppm. I checked the tap water and it was 290/288/292. After installing this crappy filtration system I tested it, then tested it at 1 week and then tested it at 2 weeks, each time the results were around 290ppm. So I got a bottle of cheap "filtered" bottled water and it showed 30.1ppm. These filters are useless if you plan to use them at home to further purify the tap water you drink. Complete Chinese two-tier garbage.
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