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Thread: Odd results, not sure what to do

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    Join Date
    Jun 2014
    Boxborough, MA

    Question Odd results, not sure what to do

    First, apologies -- I dug around but couldn't find the right thread with the answers.

    Using my handy dandy TFP kit, I just measured:
    Taylor Chlorine ~1 ppm
    pH ~7.0 (not 6.8, but not yet 7.2)

    FC 0.5
    CC 3.5
    TC = 4.0

    CYA <20

    CH 450

    TA 150

    21000 18x36 oval vinyl pool

    Battling green algae at the moment.

    What's with the high chloramines and what do I do? I'm shooting for free chlorine 10 ppm to shock, but not sure what to do about the combined chloramines.


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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Odd results, not sure what to do

    The CC is a byproduct of what little chlorine you have breaking down some algae. It is one of the 3 criteria that will be fixed when you properly slam your pool. See pool school on following the SLAM procedure.
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    TFP Guide
    PAGirl's Avatar
    Join Date
    Jun 2012
    Central PA

    Re: Odd results, not sure what to do

    I would think you might want to get some CYA in there to hold your chlorine a little while you SLAM.
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Odd results, not sure what to do

    Does the CYA test mixture get cloudy at all? What did your CYA used to be?

    If it's way lower than it used to be, and the CC is really high, you might have gotten some of whatever bacteria it is that converts CYA into Ammonia. If so, the pool's appetite for chlorine will be insatiable.

    My advice: target 10 for the FC and start dumping bleach in, rechecking every hour and replenishing as needed. Once the CC starts dropping and the green turns grey, then worry about raising CYA. But keep the pool at shock level for your CYA level the whole time. Your pH is close enough, and the TA is high, so I expect the low pH will correct itself.
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    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Hudson, WI

    Re: Odd results, not sure what to do

    Welcome to the forum

    Please add your pools info to your signature as outlined here

    CC is what it is and it isn't something you actively change it's the result or indicator of something taking place in the water. It's a result of your FC eating algae and as you destroy algae with a high enough FC level the CC drops.

    I would add a little CYA until you are sure you are 20-30ppm so you aren't losing all the FC to sunlight during the day. You need to SLAM the pool :
    Test and add bleach as often as possible to maintain your shock level.

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    And bring the pH up to 7.2
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