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Thread: CYA VERY High

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    CYA VERY High

    I estimate our CYA level at 200... using Taylor test kit recommended by TFP I tested a 50/50 mix of pool and tap water to receive a CYA level of 100.

    We are in the process of draining to lower CYA level. Question is how much volume can we remove before we have to worry about floating the pool? (24,000 gal IG plaster pool)

    Many thanks in advance for any/all advice.
    24,000 gal IG Gunite, Hayward NorthStar 2HP pump, Hayward 425 sq' cartridge filter
    Hayward Viio Turbo cleaner, Water Quality Pure Ozonator, built March 2010

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: CYA VERY High

    drain 1/3 to be safe. refill then drain 1/3 again. Test again and drain a third time if necessary.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Charlie_R's Avatar
    Join Date
    May 2013
    Mexico, MO

    Re: CYA VERY High

    Depends on your water table height. Generally, 1/3 at a time is recommended here, repeated as many times as needed to bring it down to 30-50. Guessing here, but I would say a minimum of twice, checking the CYA after each one.

    Dang it Dave, you did it again!
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: CYA VERY High


    A lot depends on where you are. (Hint: pool-school/read_before_you_post) If you live in Louisiana, you might strike water digging 2 feet in your yard. Other places might have to go 100 feet to hit an aquifer.

    1/3 should be a safe bet.
    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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