TDS Meter Calibration

Discussion in 'Lighting, Filtration & Other Equipment' started by Bifferwine, Feb 20, 2010.

  1. Bifferwine

    Bifferwine I am a girl

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    Anyone with an RODI unit needs a TDS meter to determine if and when their filters need to be changed, and if the unit is working properly. I got my TDS meter off of Ebay probably about 5 years ago for $15. It dawned on me last week that I have never bothered to calibrate it! I should know better -- when I use them for work I have to calibrate them before and after every job.

    I bought the correct NaCl calibration fluid off of Ebay ($4.95).
    HM Digital 342ppm TDS/NaCl Calibration Solution, 1x3oz - eBay (item 370311918054 end time Feb-24-10 18:04:21 PST)

    My TDS was off by about 30 ppm -- luckily it was 30 ppm too high, not too low, so my water was actually cleaner than I had been thinking.

    I haven't changed my RODI filters in nearly two years, and the output from it is still less than 10 ppm. Yay!

    Don't forget to calibrate all your instruments!
     
    Bifferwine, Feb 20, 2010
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  2. Bifferwine

    dcantucson

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    10ppm in Tucson! Impossible! ? !
     
    dcantucson, Feb 20, 2010
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  3. Bifferwine

    Bifferwine I am a girl

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    I know, right?!?! It was bouncing around between 8 and 9.
     
    Bifferwine, Feb 20, 2010
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  4. Bifferwine

    dcantucson

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    Mine is reading 65 after about 5 month old filters. :dunno:
     
    dcantucson, Feb 20, 2010
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  5. Bifferwine

    Bifferwine I am a girl

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    Oh wow. This is one reason why I love my cheapo $60 Pure Water Club RODI unit!
     
    Bifferwine, Feb 20, 2010
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  6. Bifferwine

    Beta173

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    Mine runs at 24 before the RODI and 0 afterward. I thought that it was wrong so I calibrated it and it was spot on.
     
    Beta173, Feb 20, 2010
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  7. Bifferwine

    Bifferwine I am a girl

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    Wow your water is excellent then. Here in Tucson, the tap water is anywhere between 400 and 500 :shock:.
     
    Bifferwine, Feb 20, 2010
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  8. Bifferwine

    SeattleDarko REEFER

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    Yeah I have seriously been thinking about buying a whole new unit for $100 sell the old one on CL for $50.... but I think its being to lazy how hard is it to change the resin? BTW I don't deal well with sticky stuff and it looks sticky? :shock:
     
    SeattleDarko, Feb 20, 2010
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  9. Bifferwine

    Bifferwine I am a girl

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    When I ordered replacement filters from Pure Water Club, they sent a whole new DI cartridge -- I didn't have to change any resin.
     
    Bifferwine, Feb 20, 2010
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  10. Bifferwine

    SeattleDarko REEFER

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    I can probably handle that... I have been dreading it I have some life left on my filters.

    thanks
     
    SeattleDarko, Feb 20, 2010
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  11. Bifferwine

    d2mini VIP Member

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    Mine has always 2-4 after the RO and 0 after the DI.
     
    d2mini, Feb 20, 2010
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  12. Bifferwine

    Bifferwine I am a girl

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    I'm happy that I can get in the single digits with Tucson water! Haha.
     
    Bifferwine, Feb 20, 2010
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  13. Bifferwine

    wontonflip I failed Kobayashi Maru

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    Oh wow, I didn't know I was supposed to calibrate my tds :( Guess I should get some calibration fluid. My readings are always at 0 for output...I wonder if I should worry LOL Livestock seem fine. I didn't use it much because I only had a 45g that only needed a gallon or so of top off...but of course I had it running for 2 1/2 days while filling up my 125g. *grr*
     
    wontonflip, Feb 20, 2010
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