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Thread: Chlorine levels unstable

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    Chlorine levels unstable

    Could someone please help?
    Opened AGP Saturday to green algae mess.
    Bleached the @#$% out of water and by Sunday it was clear, however, chlorine levels will not stay up. Added 3 gallons this morning, waited hour and checked at 10.5 ppm. (TF100) Checked 2 hrs later, .5ppm?!?!?!

    16X32 with 6 ft hopper

    Here are latest readings
    CYA- <20- at top of cylinder. water still clear enough to see black dot.

    Again, water in pool is still very clear and it is obvious there is some level of chlorine. Am I worrying too much?

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Chlorine levels unstable

    You need to raise the CYA level or you lose all of your chlorine to sunlight.
    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

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Chlorine levels unstable

    Chlorine is a consumable item. It must be constantly replenished. Yours is getting consumed very fast for one (or both) of two reasons...

    1. You have no CYA in your pool

    2. You have organics (algae) in your pool.

    read "The ABC's of Pool Water Chemistry" up in Pool School.....that'll help you understand both things better.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Oct 2013
    Chapin, SC

    Re: Chlorine levels unstable

    I'll vote for both!
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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