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ro/di system fittings....?


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  1. #1
    CR Member
    Join Date
    Apr 2012
    Location
    kokomo, in, usa
    Posts
    48
    First Name
    tony

    Default ro/di system fittings....?

    for an ro/di.....will brass fittings harm my water? and i plan to use a 30g pressure tank as reservoir, the fitting coming out of the tank it self is stainless so no harm but the next pipe is z shaped and i believe its copper so i'd thibnk it would need to be replaced due to leaching...yes? so can i use brass or is plastic a must? thanks to all

  2. #2
    AZDesertRat - Reefkeeper
    Subject Matter Expert
    Water Treatment

    Join Date
    May 2010
    Location
    Phoenix AZ
    Posts
    367

    Default

    Both the brass or any metal fittings and the pressure tank are bad ideas.

    Brass contains copper which can be deadly to reef inhabitants. On the tap water side its not a problem as most tap waters have a higher pH, low dissolved oxygen and what is called a positive Langlier Index. This means the wate rnot agressive and tends to scale or build up on pipes whcih is the opposite of RO and RO/DI water which is very agressive and can eat pipes and metals trying to gain back some of the ions that have been filtered out. Stainless is not safe either as the RO/DI will eat it too, just not as fast as the copper or brass and with less traumatic results. The only metals safe with RO/DI are titanium and tantalium that am aware of.

    The pressure tank is not a good idea as they make a RO system cycle onand off more frequently to replenish the lost pressure when you take water from the bladder or pressure tank. This leads to TDS creep which eats DI resin much quicker than long filter runs which cleanse the membrane lowering the TDS. Also RO/DI will leach things out of the rubber bladder causing even more problems.

    If you are set on a pressure tank, which I would discourage from personal experience, store only RO water in it, drain it 100% often so it refills completely with fresh RO and reduces the TDS creep effects and place the DI on the outlet of the pressure tank but with a valve to regulate the flow through the resin so you get proper contact time with the DI resins for best treatment. Too fast through the resin and it wil not be 0 TDS.

  3. #3
    CR Member
    Join Date
    Apr 2012
    Location
    kokomo, in, usa
    Posts
    48
    First Name
    tony

    Default

    hey thanks for the insight, so for the dumb part....how can i store water for my tanx and still send the good water to my fridge and sink? trying to run 3 things from 1 unit was the reason for the tank, any ideas i am open to

  4. #4
    AZDesertRat - Reefkeeper
    Subject Matter Expert
    Water Treatment

    Join Date
    May 2010
    Location
    Phoenix AZ
    Posts
    367

    Default

    Take a look at the diagrams here:

    http://www.spectrapure.com/huds/DWK-DI-AX.pdf

    http://www.spectrapure.com/huds/4-ST...K-RODI-NAG.pdf

    Notice the check valve between the drinking water pressure tank and the DI which is fed directly from the RO membrane. In this way you isolate the pressurized drinking water from the non pressurized RO/DI so TDS creep is not an issue. You control the DI side with either a solenoid valve and float switches which I much prefer or a simple float valve which has problems again with TDS creep since it cycles on every time the ATO reservoir drops. With float switches you can set them a distance apart, mine are 12" apart and I get 11 gallon filter runs that way.

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