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Thread: Why is CYA so high

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    Why is CYA so high

    Just tested CYA in pool to see what my target FC level should be. My test came back at CYA=80. Now here is my question pool is only in its second season ( filled last year around mid June ) and used city water to fill, so could have using pucks for just over a year bring my CYA level up so high?
    5000 gal 15 ft round AGP, 1.5 HP Heyward pump and sand filter, TF-100 test kit.

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Why is CYA so high

    Easily, especially if you do not backwash out much water or lower it to close in the winter or get a lot of rain.

    How many pucks have you used? in the Effect of Adding chemicals section at the bottom will tell you how much CYA was added.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    Re: Why is CYA so high

    Yes they will. One 7 oz puck will raise CYA by 6 ppm in 5000 gal.

    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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