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Thread: Shock Level FC Test "bounces" a little. Am I doing it right?

  1. Back To Top    #1

    Join Date
    Jun 2015
    Richardson, TX

    Shock Level FC Test "bounces" a little. Am I doing it right?

    I just got my Taylor 2006 test kit, and have started my first SLAM.

    With 50 ppm of CYA, I am maintaining a 20 ppm FC.

    Following the directions, after adding in the DPD powder and stirring, I start titrating in the drops of reagent, and reach\
    the point where the sample turns clear. I reach for the CC test reagent, and notice that the sample has turned ever so
    slightly pink, as if it were bouncing back a little. Is this normal?

    Do I keep titrating stirring, and waiting, or is this normal? From the instructions I thought the color change to clear was the indicator.
    The pink color is very slight.

    pre-slam numbers:
    TA 180ppm
    PH 7.5
    CYA 50
    CH 180 ppm
    CC 0 ppm
    FC 10 ppm

    Pool: 23000 gal, inground, plaster, sand filter, Hayward 1.5 hp single speed pump. No booster, no builtin vac, built 1976, city water.

  2. Back To Top    #2
    DaninFLA's Avatar
    Join Date
    Apr 2015
    Sarasota, FL

    Re: Shock Level FC Test "bounces" a little. Am I doing it right?

    if it went clear, you are done. if you let it sit it will turn pink again. even so, if one extra drop was the difference, that's only 0.5ppm. no biggie.
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Shock Level FC Test "bounces" a little. Am I doing it right?

    Like Dan said. Add drops until it is clear. Call that FC and start the CC portion of the test. Same with the CC count until it goes clear and you are done. If it sits, it will always go back to pink.

    If the CC are high, that could bleed into the FC portion of the test.
    Jason, TFP Moderator
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