Dave, my answer is based on the assumption that the cartridge of the TWP purifier is changed regularly. If so, the water coming out is 0 TDS, which is the same as RO/DI discharge. Why then do you feel the RO 0 TDS water is better than the DI 0 TDS water? I can't see the difference, other than the cost of replacing membranes/resins. Please explain your reasoning.
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Brad
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