TDS testing??

Discussion in 'Water Chemistry' started by emtp380, Aug 2, 2007.

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  1. emtp380

    emtp380 Spanish Shawl Nudibranch

    Joined:
    May 7, 2007
    Messages:
    97
    Location:
    NC
    I installed a meter on my RO/DI system HM Digital In-line Dual TDS Meter (Saltwater Aquarium Supplies > Reverse Osmosis > Purity Monitors ) and for some reason the readings I am getting does not make sence. I put the IN probe in the red IN line coming from the water source, and the OUT probe in the white line between the last filter and the holding tank. My system is a 100 gpd with six filters. A 3 gal. holding tank and a faucet for drinking water. My IN water reads 000ppm to 65ppm, and the OUT water reads 100ppm to 150ppm. The probes have "IN & OUT" labeled on them so I thought I had them in the right hose. Do I have them backwards? or could they be mislabeled? Any thoughts,,Thanks
     
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  3. inwall75

    inwall75 Giant Squid

    Joined:
    Sep 10, 2003
    Messages:
    7,172
    Location:
    America
    That unit requires that the double pin probes are either exactly perpendicular to the waterflow or exactly parallel to the waterflow. I can't recall which one. Find your manual. That should fix the problem for you.