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Thread: TA and CYA Concerns

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    TA and CYA Concerns

    I have a 15' AGP. My results as of this morning are as follows:

    FC - 5
    TC - 5
    CC - 0
    pH - 7.5
    TA - 120
    CYA - 25

    How concerned should I be about the high alkalinity? My water is sparkling clear and I have very little pH fluctuation. Also, is my CYA too low? Although I've switched to bleach, I have eight left over 3" tablets. How much can I expect my CYA to rise if I use these? Thanks for your help.
    11000 gallon Viking Fiberglass 12 x 28, Intellichlor IC-40 SWG, 24" cascade fountain, 12" cascade fountain, 1 1/2 HP pump, sand filter

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

    Re: TA and CYA Concerns

    Eight trichlor tablets would raise CYA by between 40 and 55. That is approximate because 3" trichlor tablets can be 7 or 8 oz, and the pool volume will vary a little depending on water depth.

    I would use three of the tablets now (one at a time) and then switch to bleach.
    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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