Whichever brand of RO you get the most important thing is that it should function at 70 psi and temps below 75 F or you won't get the rejection rate that makes pure water production cost effective. I can't remember the specific name for that type of RO, however. I'd suggest investing in a ready made RHG product rather than making your own. I know some guys say they've saved money but I don't think they factor in their time or the failed pieces they bought and didn't use.
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