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Thread: RO vs RODI

  1. #1
    Senior Member
    Join Date
    Nov 2007

    RO vs RODI

    I'm looking at picking up an RO unit for water purification.
    Costco has an RO until for ~$130.
    My question is, what the major differences between RO water and RODI water? Is it worth the extra $$ to get a unit with RODI?

  2. #2
    Former Moderator a4twenty's Avatar
    Join Date
    Nov 2006
    the DI stage polishes the water and removes anything that has made it past the RO membrane. for example my tap water has a TDS ( Total Dissolved Solids ) of 135ppm, after the RO membrane 2ppm ( i change it when this number reaches 6 ) and a TDS of 0 after the DI stage. ( i change the DI resin when i get 2 -3 ppm after the DI stage )

    if you're keeping a FOWLR then RO water is usually good enough but if you want to keep corals then i would recommend adding the DI stage. also look into getting a TDS meter so you know when to change your membrane ( ~ 3 years ) and DI resin ( ~ 6 - 8 months depending on the condition of the membrane ), they can be found at most of our sponsors.

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