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Thread: Correct CYA for Sunny Pool

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    Join Date
    May 2014

    Correct CYA for Sunny Pool

    I have posted my testing results under a separate post and all seems ok with the tests. My pool receives direct sunlight from about 9 am to about 4ish. My CYA is currently at or near 30 (probably slightly lower). Yesterday I added 1 lb of stabilizer to bring it up closer to 40 (I will test again in a couple of days). While reading the Pool School basics, it says that for pools with direct sunlight for most of the day, the CYA could (should?) be maintained in the 70-80ish range. I have been adding about 1/2 gal of liquid Chlorine each evening to maintain FC at the 3.5-5 range.

    Should I slowly boost CYA higher and then raise my FC accordingly. will that help reduce the amount of chlorine necessary just to maintain proper levels that otherwise will be utilized during the sunny days?

    17k gallons, IG pebble, cartridge; TF-100 test kit

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

    Re: Correct CYA for Sunny Pool

    I don't think you'll see much difference between 50 or 70. But I would go ahead and boost it a tad bit higher than 40. Doesn't have to be exact - it's a range. You just need to know what it is to maintain your min levels and know your shock level. Which hopefully you won't need.
    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

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Correct CYA for Sunny Pool

    In a laboratory, you will reduce the chlorine loss to the sun with higher CYA. In reality, it probably won't be enough to notice. Also bear in mind that there's an upper limit to the colormatching FC test, and if your minimum FC is above that, you'll have to use the FAS-DPD powder test every single time.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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