What a TDS Meter Can (and Can't) Tell You RSS

A lot of people—and a number of water filter companies—would have you believe that TDS (total dissolved solids) meter readings are the best measure of water’s overall suitability for drinking, which is totally false. TDS meters are generally easy to use, and while they can tell you certain things about your water, a TDS meter cannot tell you if your water is safe to drink based solely on the levels of total dissolved solids. Contrary to some of the advertising used by reverse osmosis (RO) system and water pitcher brands you may have seen or heard about, a TDS meter only tells a small...

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