I"m on a community well system. Pretty hard. comes out oftap 300-700PPM depoending. Usually around 400. My RO is 5micron/1micron/carbon/RO/DI I have just been changing ALL filters and DI at same time, only changed Membrane once. Water is/has never been 0 coming out of unit. allways 2-8ppm depending
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Dan Pesonen
Umm, a tank or 5
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