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RODI reading 87ppm

Discussion in 'General Discussion' started by Armydog, May 16, 2015.

  1. May 16, 2015 #1
    Armydog

    Armydog Expert Reefkeeper

    4,038
    Ratings:
    +738 / 8 / -0
    Ok so i have replaced all of my filters and di resin and added another stage to my system. The only thing i didnt replace is the gpd Membrane. Why is it reading this high :/ has anyone had this problem? Should i replace the membrane also?
     
  2. May 16, 2015 #2
    F.D. Reefer Fort dodge

    F.D. Reefer Well-Known ReefKeeper

    506
    Fort dodge
    Ratings:
    +98 / 1 / -0
    Could b air in Gpd housing.
    Iv had to kinda tilt it bak & forth & up & down to get all air outa mine b4. & then it worked fine.
    I wouldn't think you'd need to change membrane, but I'm no expert.
     
  3. May 16, 2015 #3
    blackx-runner Cedar Rapids, IA

    blackx-runner Administrator Website Team Leadership Team

    6,044
    Cedar Rapids, IA
    Ratings:
    +738 / 5 / -0
    What is it before and after the RO membrane? That will be the best indicator for needing to replace the membrane. A good 75gpd membrane will have a rejection rate of 98%. I think typical for membranes we buy for our units is 95-98%. If you aren't getting that it's time to replace it.
    They now have 3 position inline TDS meters that would come in handy. Before and after the RO membrane, then after the DI would be the best places to test TDS. A simple press of the button and you can gauge filter life.
    I wouldn't run anything more through your DI until you get figured out. If you're outputting 87ppm after the DI you might have even exhausted it already.
     
  4. May 17, 2015 #4
    Nik Windsor Heights

    Nik Experienced Reefkeeper

    2,397
    Windsor Heights
    Ratings:
    +13 / 0 / -0
    Are you sure your meter is good?
     

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