Depending upon what the ...

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Depending upon what the contaminants in you well water, you want to design the system that removes only those contaminants and not the other minerals you need in your drinking water.  Normally you want to use a pretreatment for both RO and EDR to avoid plugging the membrane. These approach removes all dissolves solids. The difference between these two technologies is for RO you have the softener as part of its pretreatment that would require salt for regeneration and EDR reverses the polarity of electricity connected to the membrane to reject the removed ions.