I bought this based on the rave reviews for low TDS ratings but I am very disappointed. My old diaphragm needed replacing and was creeping up to 15-20 TDS. I installed this and didn't think to check the TDS until a few days later when I saw limescale build up in my kettle. This thing is leaking more solids and my TDS is now in the 90-100 range. Unacceptable for an expensive membrane. I put my old diaphragm back in and was right back at 15 TDS. That's expensive garbage. Now I will order a new diaphragm elsewhere.
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