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Thread: Overshot CYA

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    Overshot CYA

    So my liner needed repaired. All done and refill completed. I slightly overshot my CYA and now it sits at between 90 and 100. Should I do anything or just let it be and await some backwash and water add?

    Thanks,

    Ted

  2. Back To Top    #2
    Richard320's Avatar
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    Re: Overshot CYA

    Well....if the pool is otherwise clear, it can be maintained with CYA that high. I've done it myself, due to water restrictions in place at the time.

    You'll need to maintain a higher than usual FC level. Total demand won't increase, just the minimum level. And that also depends on whether you use bleach or a SWG.

    If somehow you get algae, you're going to be in a world of hurt, because you'll be needing bleach by the barrel to clear it with CYA that high.
    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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    Re: Overshot CYA

    It is a SWG Vinyl IGP. Right now other prams are:

    FC - 9
    CC - 0
    PH - 7.4
    TA - 70
    CH - 90
    Borates -50
    Salt -3400

    My Super Chlorinate went a bit higher in PPM than I thought, hence the 9ppm of FC. I really don't want it that high. Water is crystal clear.

    I tested all numbers with Taylor kit and the had pool store verify CYA with both An older Lamotte test system and the new Spin Photometer. Both verified CYA.

  4. Back To Top    #4
    Richard320's Avatar
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    Re: Overshot CYA

    Quote Originally Posted by thadius65
    It is a SWG Vinyl IGP. Right now other prams are:

    FC - 9
    CC - 0
    PH - 7.4
    TA - 70
    CH - 90
    Borates -50
    Salt -3400

    My Super Chlorinate went a bit higher in PPM than I thought, hence the 9ppm of FC. I really don't want it that high. Water is crystal clear.

    I tested all numbers with Taylor kit and the had pool store verify CYA with both An older Lamotte test system and the new Spin Photometer. Both verified CYA.
    Just turn down the SWG. Pool Calculator says 5 to 13 for that CYA level, so you're fine.
    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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    duraleigh's Avatar
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    Sebring, Florida
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    Re: Overshot CYA

    Actually, you do want your FC that high. With your CYA so high FC must be maintained MUCH higher than if your CYA was at the proper level.....look it up in the chart in Pool School.

    Let me also say that Richard320 is a meticulous pool manager and has a complete grasp of his pool and the methods by which to control it. Managing a pool with CYA as high as yours is not at all easy. I would strongly urge you to lower it.

    Secondly, pool store testing verifies virtually nothing....regardless of technology.

    You should always trust your own testing.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Re: Overshot CYA

    I think I am going to do a series of backwashes over next few weeks to get to a 25% replace and get me back to my pre-liner fix of 70-80.

    Thanks!

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