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Thread: Trying to balance with no cya

  1. Back To Top    #1

    Join Date
    May 2010
    El Dorado, AR

    Trying to balance with no cya

    Did full test this morning and here are the results.
    FC 10.5
    PH 8.2
    TA 140
    CYA 0
    SWG 3000

    I know I am starting the shock process. Water is clear but I don't think FC is holding yet. I added stabilizer in a sock/skimmer last night. I know it won't show up for a week or so. If I'm researching correct I need to first lower ph and that will lower TA. Just unsure of what to do next. Because of cya level I'm not sure what shock level is. Any advice is appreciated. Thanks in advance!
    18 x 36 x 8 in ground vinyl, 20,000 gallons
    1 1/2 hp Hayward pump with sand filter
    Just swapped to a SWG

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

    Re: Trying to balance with no cya

    For today, shock level is 10. Starting 24 hours after you added CYA, assume that CYA is at the level you were aiming for and look up the appropriate shock level.

    The next time FC is below 10, which should be very soon, adjust the PH down to between 7.2 and 7.5. That will also lower TA a little, which is all you can do for TA right now.
    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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