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Thread: FC levels consistently different

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    Whatrymes's Avatar
    Join Date
    May 2011
    E. Bridgewater, MA

    FC levels consistently different


    I have my new TF-50 kit and have been using it and other methods to act as a surrogate control. I consistently get results that confuse me.

    TF-50 FC=3.0
    Aqua check stick about 1.5-2

    I'm real careful with each test and the ratios remain the same?????


    Oh last TF-50 readings:
    CC=< 0.5

    ... sparklin' and beautiful.
    15 X 30 X 3.6 Ester williams AGP
    10,800 gallons
    Haywood EC40C90 DE filter 1 HP pump
    TF-100 Test Kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: FC levels consistently different

    The FAS-DPD test is much more reliable than the OTO test for determining the precise FC level. Still there is some possibility that you are doing something wrong. It is important to fill the sample tube to the correct level, 10 ml, hold the dropper bottle vertically, to squeeze drops out slowly so they fall naturally and don't get "sprayed" out, and to multiply the number of drops by 0.5 (instead of just taking the number of drops as the FC level).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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