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Thread: Low CYA

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    Low CYA

    Yesterday morning: Water temperature 75 and pool is uncovered. Water is crystal clear but FC is 1 ppm and CYA is less than 20 ppm. Used the Pool Calculator and decided to add 364 oz bleach to get the FC higher. Added tri-chlor tablets to the auto chlorinator since we are going out of town tomorrow morning for several days. Installed the new solar cover.

    Here are the water parameters as measured at 8 PM last evening:
    FC: 7.5
    CC: 0
    pH: 7.5
    TA: 70
    CYA: less than 20

    Here are the water parameters as measured at 5:30 AM this morning:
    FC: 7.5
    pH: 7.5
    TA: 70
    CYA: less than 20

    My plans are to wait till we get back and then test the pool water. Should I take action now to bring the CYA into specified range or wait till we return?
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

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

    Re: Low CYA

    As long as you are going to be using trichlor for a couple of days, I would wait and deal with the CYA level afterwards.
    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: Low CYA

    Good. That is the answer I needed and definitely will be most convenient for me.

    Wonderful forum. Thanks for all the help.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

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