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Thread: CYA ????

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    Join Date
    Jul 2015
    Location
    Chesterfield, VA
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    3

    CYA ????

    Small, 3,500 gal Intex above ground pool. CYA is 88ppm and pool store told me to drain and refill. Hubby says it's not necessary to do that and it won't hurt us. I shocked the pool in the early am before the sun got bright then took a sample in to have it checked. Pool store clerk says it's to out of balance to test until the shock gets to work but that at 88 ppm I need to drain some water and refill.

    We changed out the cartridge filter to a Hayward sand filter this season.
    Last edited by Hapiee; 08-11-2016 at 02:08 PM. Reason: update filter info
    3500 gal, AG, Cartridge filter type A, Intex Easy Set pool w/filter set up 3 wks ago, well water, Ubsta-Test 5 Plus strips.

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    jwhop3's Avatar
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    Jun 2014
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    Rocky Mount/Virginia
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    78

    Re: CYA ????

    Think of cya as a chlorine retarder. It binds a certain amount to use later, so even though your test results might say your FC is adequate, or even high, you can still have an algea bloom. I have always kept mine at 50 ppm, once this summer mine got to ~70ppm, and I started chasing cloudy and green-tinged water. To know what you would need to drain, divide what you want by what you have, then subtract from 100. To get to 50ppm, 50/88 = 57% - 100 = 43%. That would be a significant drain, so it would be cheaper for you to just refer to the CYA/Cholrine demand chart and put in the required level for your cya reading.
    14,000 gallon Fox Lagoon, ingound vinyl
    PacFab Sand filter
    installed April, 2002
    Frog inline chlorinator
    Town water

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    duraleigh's Avatar
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    Re: CYA ????

    Probably not much swim time left for you. I would just refer to the chart as above.

    Next year keep your FC around 50 ppm.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    26venus's Avatar
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    Jul 2013
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    Shenandoah Valley, VA
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    46

    Re: CYA ????

    Quote Originally Posted by duraleigh View Post
    Next year keep your FC around 50 ppm.
    I think he meant CYA around 50

    16 x 36 IG Vinyl, 20,000 gal, chlorine, built 2001
    Hayward 3/4 HP Super Pump
    Hayward Pro Series sand filter S210T
    All in with TFP , testing with tf-100


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    Sebring, Florida
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    Re: CYA ????

    Sorry! Yes, CYA at 50.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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