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Cleanz, it will be worth going WFP whichever route you take to make your pure. If you do go RO, would you need twin di as the RO will bring the water right down anyway? What I mean is, if the RO brings it down to say 007 your resin will last a long time. I use twin di as my PPM is around 060.
Maybe an RO user could explain in more detail as I know naff all about them.