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Thread: Quick FC/CC Drop Test Question

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    Join Date
    May 2015
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    Quick FC/CC Drop Test Question

    I have a quick question on the TF100 FC/CC drop test. I did a test and forgot to clean the tube out right away and I noticed that after an hour or so the clear liquid turned back to pink. This is normal right? Just want to make sure I am not testing incorrectly. Thanks!
    20k? gal, IG plaster, 3HP Pentair Intelliflo variable pump, Hayward cartridge filter, built in 1987 with spa but currently have no heater.

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    ship of fools's Avatar
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    Nov 2011
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    Albany, NY
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    Re: Quick FC/CC Drop Test Question

    Quote Originally Posted by Sir Thomas Hobbes View Post
    I have a quick question on the TF100 FC/CC drop test. I did a test and forgot to clean the tube out right away and I noticed that after an hour or so the clear liquid turned back to pink. This is normal right? Just want to make sure I am not testing incorrectly. Thanks!
    Yes - completely normal. The initial color change is the one you are interested in.
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    Texas Splash's Avatar
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    Jun 2014
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    Re: Quick FC/CC Drop Test Question

    You should be fine. It is advised to take/use the readings immediately after doing the initial drop test to measure FC. Once the liquid is clear, follow-up immediately with the CC test then discard the liquid. Anything you may have left or forgotten about after your testing is invalid and just waste.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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