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Thread: Free Chlorine Trouble

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    Free Chlorine Trouble

    New to site and frustrated with my pool. Troubleshooting for 3 days now.
    My metrics are as follows:
    Vinyl inground pool with 22k gallons. Jandy pump with cleaning system and inline chlorinator
    Free chlorine was zero over weekend and I had pink algae surface in skimmers but nowhere else in pool. I shocked twice and was able to keep FC at 3-5 ppm for over 32 hrs. All other levels right on target. Treated with pink algaecide. No sign of it since. Pool is super clear. I took reading this morning and everything was perfect. I only added some calcium to raise by 50 ppm. 12 hrs later and everything is good except FC is zero and TC is also zero. I havent backwashed at all. Other readings are TC = 0, alk = 100, ph = 7.6, CH = 100, CYA = 50-60. Any help is appreciated.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Free Chlorine Trouble

    You are either not adding enough chlorine to your pool to keep it in there during the day or you have an algae bloom or both.

    I would add enough chlorine to get to somewhere around 10 ppm tonight, shut of all other sources of chlorine and perform the OCLT. Pool School teaches you how and we will help.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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

    Re: Free Chlorine Trouble

    Whatever you are calling "shocking" isn't the correct procedure. [shock:etenxr3x]You need to SLAM your pool.[/shock:etenxr3x]
    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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    Join Date
    Jun 2012
    Howell, NJ

    Re: Free Chlorine Trouble

    What kind of test kit do you have? To properly SLAM the pool, you will need the TF-100 or K-2006, which are linked to in my signature.
    7 year old ~13,500 gal 24' AGP with 1.5 hp Proline pump, 150 sqft Pleatco cartridge, filled with well water with pH of about 4.5.
    Wanda the Whale pool vacuum, home made heater, Taylor K-2006
    Cloudy Pool? 1) Order test kit. 2) Follow SLAM
    New to TFPC? Read Pool School a few times, then post questions. PoolMath will help with chemical additions.

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