Ro Vs Rodi Question

Discussion in 'Freshwater Beginners' started by 6666666666, Aug 6, 2017.

  1. 6666666666Well Known MemberMember

    Hey Everyone,

    The tap water where I live is very hard and has high chloramines and very high TDS. When I do water changes I add a little bit of RO water to dilute it and also make it a little softer. The thing is the place I usually get my RO water system is out of service so I'm wondering if I used a little RODI instead if it's going to make a big difference?
  2. TwoHedWlfWell Known MemberMember

    RODI is going to be even purer than RO. But an RO filter will get something like 90% of the TDS out of the water, DI something like 90% of the remaining.

    For your use, it's not very demanding. So they're effectively interchangeable.
  3. 6666666666Well Known MemberMember

    So you think I'm ok using a little DI instead of RO? It won't have any different effect or anything?
  4. TwoHedWlfWell Known MemberMember

    Assuming you mean RO/DI and not just DI, then yes.

    You'd never really want to use just DI when filtering because your DI resin would be exhausted very quickly. It would be a waste of money.
  5. 6666666666Well Known MemberMember

    Yeah sorry I mean RODI. Thank you for the info. Usually my RO is around 7 or 8 TDS and RO/DI is around 0 or 0.5

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