TDS in my previous filters that came with the GE filtration system was only 5-8ppm initially and eventually reached over 100ppm for over 2 years which has me prompted to buy this set as a replacement. I followed the directions, ran the water through 5 gallons, then measured again and got 140ppm. The ppm value is even significantly higher than before the filter change. What a disappointment. Edit: Thanks to Membrane Solutions Corp, I had the membrane replaced. After replacing the original, tds is now measured at <20ppm. The previous one was broken, but the service department definitely fixed it.
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