It is softened first but it doesn`t really matter. If the water is 1600 ppm going into the softener it`s still 1600 ppm coming out. All the softener does is exchange minerals for salt. Ideally it`s a 1:1 ion swap so the amount of impurity doesn`t change, just what kind of impurity it is. Without the RO pre treatment I would get about 30 gallons out of a full resin refill. That got expensive quickly!
- Patrick
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