di resin

  1. R

    Making RODI Water

    Hi Guys, I have an under counter RO System that we installed about a year ago, I got a TDS Meter from my LFS and got around a 9ppm reading. I understand that that is ok for use on marine tanks? I also heard that you have to use a DI resin with the RO system that could help bring the TDS down...
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