My tap water has around 220 ppm. After installation, TDS checks after flushing 3 gallons. The reading is 12 ppm, which is pretty good. After just a month of use it was 50ppm. Another month later 70ppm. Now it's 84ppm. This thing should last 1 to 1.5 years. I've been using Watts Premier for over 10 years, the filter typically lasts at least 1.5 years. This is unacceptable. I'll look around for another brand.
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