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Thread: CH took 58 drops to turn blue

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    kmwest3302's Avatar
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    Jun 2014
    Location
    Danville, IN
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    13

    CH took 58 drops to turn blue

    I tried using my TF-100 last night for the first time. I got the following readings:

    FC - 2.0
    CC - 25
    TC - 4.5
    CH - 1450 (??)
    TA - 190
    CYA -50

    I feel the results could be believable, except for CH. It took 58 drops to turn blue. Slowly changed from red to pink to link pink to purple to finally blue. I went to the pool store we have been using with a sample this morning, the show CH 155. What could I have done something wrong? The other readings from the pool store were:

    FC - .53
    CC - 1.15
    TC - 1.68
    pH - 7.2
    TA - 106
    CYA - 49

    Thanks for your help
    25,000 gal IG Vinyl
    Tagelus TA-60 Sand 60 gpm
    1 HP Whisperflo Single Speed
    Built April 2004
    Using TF-100 Test kit

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: CH took 58 drops to turn blue

    Welcome to TFP!

    When the CH test turns purple it is called a fading end point, which results in false high readings.

    See this post for some suggestions on how to avoid a fading end point.
    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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    ComputerGuyInNOLA's Avatar
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    Oct 2012
    Location
    Mandeville, Louisiana
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    602

    Re: CH took 58 drops to turn blue

    A CC reading of 25? Really? I would test again. Follow Jason's advice on the fading endpoint.
    Gunite/Plaster pool at 13k gallons. All Jandy with CL340 series cartridge filter, 1.5 HP Jandy Stealth pump. Jandy 1400 SWCG and PDA4 controller. Dual waterfalls. Polaris 280. Pool installed August 2012. Southern Louisiana. And lets not forget my trusty TF100 test kit!

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    kmwest3302's Avatar
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    Jun 2014
    Location
    Danville, IN
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    13

    Re: CH took 58 drops to turn blue

    Thanks Jason. Our pool is reading a high amount of copper (per the pool store analysis).

    I also found where I can do a new post. Thanks again!
    25,000 gal IG Vinyl
    Tagelus TA-60 Sand 60 gpm
    1 HP Whisperflo Single Speed
    Built April 2004
    Using TF-100 Test kit

  5. Back To Top    #5
    kmwest3302's Avatar
    Join Date
    Jun 2014
    Location
    Danville, IN
    Posts
    13

    Re: CH took 58 drops to turn blue

    Sorry the CC was 2.5
    25,000 gal IG Vinyl
    Tagelus TA-60 Sand 60 gpm
    1 HP Whisperflo Single Speed
    Built April 2004
    Using TF-100 Test kit

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