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Thread: Should I increase the CYA level?

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    Should I increase the CYA level?

    Here are my current levels:

    FC: 0
    PH: 7.4
    TA: 150
    CH: Can't remember here at work
    CYA: Less than 30

    Used the K2006 test kit.

    I tried to shock it using 6% bleach and added approximately 215 ounces to our pool yesterday plus 14oz of Borax to raise the PH slightly.
    This afternoon it is still registering no FC and very low CYA.
    Water was pretty clear before shocking it but turned slightly cloudy after adding the bleach.
    It is still cloudy today.

    What should I tackle next?
    15'x30'x48" Steel Wall/Vinyl Liner AGP (approx 10,000 gallons)
    1.5hp Hayward Motor and Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Should I increase the CYA level?

    Welcome

    Getting the CYA to around 30ppm can help protect the FC from the sun during the shock process (not a 1 time addition as you described). You will really want to have one of the recommended test kits (see my sig.) to get your through the process and to help maintain your pool.

    Review these to get you started on the process:
    Defeating Algae

    Turning Your Green Swamp Back into a Sparkling Oasis

    Shocking Your Pool
    Jason, TFP Moderator
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    JasonLion's Avatar
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    Re: Should I increase the CYA level?

    Yes, raise CYA to between 30 and 50.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Isaac-1's Avatar
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    Re: Should I increase the CYA level?

    How about telling us a little history on your pool, is this a fresh fill, what sort of chemicals have you used in the past, etc. Cloudy water may be algae, but given your description of it showing up after adding bleach, I would suspect high calcium hardness or maybe metals in the water first.
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    Re: Should I increase the CYA level?

    It was a new pool and filled last summer (late summer). Opened the pool to crystal clean water and the kids have even been swimming before I have added any bleach or chlorine. It isn't super cloudy but definitely has a haze to it that we haven't seen before.
    Is there a way a raise CYA without going to a pool store for stabilizer?
    15'x30'x48" Steel Wall/Vinyl Liner AGP (approx 10,000 gallons)
    1.5hp Hayward Motor and Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Should I increase the CYA level?

    You can usually find stabilizer/conditioner/cyanuric acid at Walmart and maybe at the big hardware stores. It is possible to go to the pool store and only buy what you need though

    FYI, each pound of stabilizer will raise your CYA by 12ppm in a 10k gallon pool.
    Jason, TFP Moderator
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    Re: Should I increase the CYA level?

    Regarding our past chemical usage it has only ever been bleach and floater pucks last summer.

    How many times will I need to dump bleach into it to truly shock it? Or should I just buy pool store shock?
    15'x30'x48" Steel Wall/Vinyl Liner AGP (approx 10,000 gallons)
    1.5hp Hayward Motor and Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Should I increase the CYA level?

    Quote Originally Posted by drc525
    Regarding our past chemical usage it has only ever been bleach and floater pucks last summer.

    How many times will I need to dump bleach into it to truly shock it? Or should I just buy pool store shock?
    The pucks were previously adding your CYA.

    Read the links in my first posts which answer your other questions.
    Jason, TFP Moderator
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  9. Back To Top    #9

    Re: Should I increase the CYA level?

    Thanks for the links but I still don't understand if I'm supposed to add more bleach every day, once a week or whatever other combination until it reaches shock level.
    15'x30'x48" Steel Wall/Vinyl Liner AGP (approx 10,000 gallons)
    1.5hp Hayward Motor and Cartridge Filter

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    Mod Squad jblizzle's Avatar
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    Re: Should I increase the CYA level?

    You add enough bleach to get above you FC shock level all at once.
    Test after an hour and add more bleach to get above FC shock level again.
    Repeat as needed.
    You can extend the time between tests as the FC starts to hold

    If you are not shocking, then you will need to add bleach everyday to stay in the recommended FC levels.

    The levels are based on your CYA according to Chlorine CYA Chart
    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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    Mod Squad Bama Rambler's Avatar
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    Re: Should I increase the CYA level?

    Just to reiterate, chlorine gets used up constantly by organics and the sun so you have to replenish it at least every day unless you're shocking to kill something, then it's as often as you can. Preferrably once an hour in the begining.
    Dave J. TFP Moderator
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