TDS in Nanaimo typically runs about 8ppm, if it gets above 15 I shut my system down and wait for the spike to pass (guess I am kinda spoiled here). I run a membrane and have had the same resin for well over a year (colour changing and is indicating it is close to done) and I go through a fair bit of water. I would expect to go through a lot of resin without a membrane and still not have clean water.
Dan
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