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Thread: .5 CC all season so far. Why?

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    .5 CC all season so far. Why?

    This is my first year using unstabilized chlorine and it seems strange that regardless of what I do, I always have a .5 CC reading. It is never higher and never lower. I am using the TF100 kit. Any ideas why this is?

    Todays Readings:

    FC 9.5
    CC .5
    TC 10
    TA 80
    CYA 40
    pH 7.5
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump


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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: .5 CC all season so far. Why?

    Because your doing things right
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from
    ~Remember TFP counts on your donations to keep this site ad free~

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: .5 CC all season so far. Why?

    There are two possibilities, neither one is a problem. First, some pools simply always have a very low CC reading. Even really really low levels will show up as 0.5. CC isn't an issue at 0.5 or lower, so this isn't a problem. Second, you might be doing the test just slightly wrong. Make sure the sample goes completely clear during the FC phase of the test, before continuing on to the CC portion of the test. It is possible for some people to mistake a very faint pink for completely clear. If you do, you can mistakenly read some of the FC as if it was CC.
    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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    Re: .5 CC all season so far. Why?

    Thanks for this information I have been having the same problem, it has been driving me crazy. My next test tomorrow I will try to make sure I am more careful. When I have to start the test it for CC it is so lighlty pink but there is a tint. Thanks for the info.

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