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Thread: High CYA...........

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    High CYA...........

    What is the harm of running with high CYA?? Is it harmful or just expensive? THANKS (can't really drain pool now)
    25,000 gallon....36x18....inground vinyl....hayward 1 1/2 h.p. pump.....pentair de filter

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    Re: High CYA...........

    how high are we talking about? Up to a certain point it can be managed but it does complicate pool maintenance.

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

    Re: High CYA...........

    The primary issue is that you need to maintain the correct FC level for your CYA level. As the CYA continues to go up various other issues come into play, such as high FC levels interfering with PH readings, the huge amounts of chlorine needed to fight algae, and significant difficulties measuring just how high the CYA level really is when it is above 100.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: High CYA...........

    Can the type of shock used cause a high cya reading? THANKS
    25,000 gallon....36x18....inground vinyl....hayward 1 1/2 h.p. pump.....pentair de filter

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: High CYA...........

    Certain products used for shocking your pool, like dichlor, do contain CYA and would therefore increase the CYA level.

    The reason we recommend bleach/liquid chlorine for shocking your pool is because it does not have negative side effects, like raising the CYA.
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    HIGH CYA..............

    Merged post. Butterfly

    Is running with a high CYA (over 100) make me open to metal staining?
    25,000 gallon....36x18....inground vinyl....hayward 1 1/2 h.p. pump.....pentair de filter

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: High CYA...........

    How's about some pics or test results. Alot of questions here, can you give us some more specifics about what you are dealing with, perhaps we can help better that way.
    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
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