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I'm shopping around for a RO system to filter my tap water which is at +-350ppm down to 0ppm. I saw (in a video) a single stage inline system that claimed to bring tap water of 300+ppm down to zero, is there such a thing? Seem to me it would have an extreme amount water water which I don't want. I will only be using it to maintain a 50 gallon reservoir using on average 15-20 gallons a week at peak times. Simple, affordable and effective is what I'm looking for.