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Thread: Can't keep any Free Chlorine

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    Can't keep any Free Chlorine

    2 days ago I Shocked with 2 #'s of shock, tested today and the FC was at about .5 I added 2 .5 qts of 6% bleach this morning, tested in the evening and the FC was still at about .5 Whjat could be eating up all my chlorine.....The pool is 17,000 gallons, ph at 7.4 and CYA was at 0 but added conditioner 1 day ago, so it should be coming up....
    17,200 in ground Vinyl pool......
    Salt Water
    Sand Filter

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Can't keep any Free Chlorine

    When the CYA level is very low, you can lose all of your chlorine to sunlight in less than a day.

    Algae can consume all of your chlorine quite quickly.

    Also, sometimes when opening in the spring there is a substantial chlorine demand for a while.

    What does your water look like?
    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: Can't keep any Free Chlorine

    It is fairly clear....
    17,200 in ground Vinyl pool......
    Salt Water
    Sand Filter

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Can't keep any Free Chlorine

    With clear water there probably isn't any algae. Still, the 2# of shock you added would have be consumed by sunlight. That means that all you really lost was 2.5 qts, which really isn't all that much chlorine, perhaps 3 ppm at most.

    Regardless, the solution is more chlorine. You need to keep adding chlorine until you can maintain a FC level.
    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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    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
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    11,963

    Re: Can't keep any Free Chlorine

    Perhaps it has something to do with your recent Absorbic Acid treatment.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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