Rarely in any water treatment will ONE device (technology) be enough to handle desired results. A sequence of methods (system) may be required to correct water issues. First, know what know what the issues are.
Does demineralization remove VOCs, organics, nititrates, pesticides, MTBEs, and "allthosezenes", etc. That is way ROs have a number of filters/membranes making it system. An RO may also need some kind of pretreatment such as softening.
Andy Christensen, CWS-II
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