We are on well water, my RO has 2 prefilters, 1 carbon, 2 membranes and DI resin to get TDS to 0. Adding the second membrand really shortened the time it takes to produce water. I change the prefilters approx every 100g, carbon every 150-200g and DI resin every 800-1000g so yes I think this is alot more than people on city water. We are looking at putting an iron remover in our house.
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