TDS of R.O water

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by geoffrey, 22 Jul 2008.

  1. geoffrey

    geoffrey

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    Ok i just replace my membrane today along with the carbon block, i also added a 1micron filter into my other chamber.

    ran the carbon for a while, to get rid of all the crap. then i ran the whole thing for about 2 hours now and the tds is stuck on 7. it wont come down... whats up?

    could the DI resin be the problem?
     
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  3. Mekaeel

    Mekaeel Moderator

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    When last did you change the Resin?
     
  4. OP
    geoffrey

    geoffrey

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    i havent changed it since ferdie gave it to me. its yellowish on one end and dark brown on the other end. i cant figure this out...
     
    Last edited: 22 Jul 2008
  5. Mekaeel

    Mekaeel Moderator

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    How old is the Resin,any idea?
     
  6. viper357

    viper357 Admin MASA Contributor

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    What is the TDS of your tap water?
     
  7. OP
    geoffrey

    geoffrey

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    no idea. i'll ask ferdie. what does resin cost anyway? and where does one get it?
     
  8. Mekaeel

    Mekaeel Moderator

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    It cost about R350.00 for the Resin.Im sure Ferdie will stock if he stocks RO units.
     
  9. viper357

    viper357 Admin MASA Contributor

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    When the resin goes yellow that means it's exhausted and needs to be replaced.
     
  10. viper357

    viper357 Admin MASA Contributor

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    For the complete unit maybe, but a refill is about R80 - R100 I think.
     
  11. OP
    geoffrey

    geoffrey

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    well i think when i bought it ferdie said on the thread that he replaced all filters and resin. why is it yellow so quick? only been 2 months?

    what filters do u guys have in your r.o units?
     
  12. viper357

    viper357 Admin MASA Contributor

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    My resin is normally completely exhausted after 3 months, also I replace my prefilters every 6 months.

    How much of your resin is yellow?

    It also depends on the TDS of your tap water, if that is very high then your filters and resin will finish up pretty quick. My tap water TDS is normally around 57 and my resin only lasts 3 months.
     
  13. Warr7207

    Warr7207

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    Be careful, the newer resins are now yellow when new.
     
  14. OP
    geoffrey

    geoffrey

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    ok my tap water has a TDS of 200... and my resin was 3/4 yelow and 1/4 brown. i mixed the resin up a bit and now its a light brown. TDS is still at 7 though.
     
  15. Mekaeel

    Mekaeel Moderator

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    Pretty sure it is your Resin thats causing the high TDS.
     
  16. viper357

    viper357 Admin MASA Contributor

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    Thanks Warr, I wasn't aware of that.

    I reckon if you replace your resin it should bring it down, 200 TDS is very high, means your unit has to work harder and the filters exhaust quicker. :(

    Is your TDS meter calibrated?
     
  17. OP
    geoffrey

    geoffrey

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    dunno. how do i callibrate it?
     
  18. martin

    martin Reef Adict

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    Why not bypass your resin filtre and test?
     
  19. OP
    geoffrey

    geoffrey

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    i just did that. its still 7. so the high tds is definitely not coming from the resin
     
  20. martin

    martin Reef Adict

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    And if you test it on distilled water? Maybe it is callobrated to a min of 7?
     
  21. OP
    geoffrey

    geoffrey

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    no i have gotten a reading of 0 on other R.O water. and mine used to be at 3. now when i put new stuff in its up at 7??
     
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