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Thread: When to raise CYA?

  1. Back To Top    #1

    Join Date
    May 2013
    Location
    Southeast PA
    Posts
    5

    When to raise CYA?

    Background:
    New pool owner, pool is about 30 yrs old. We used a pool service company to close (moved in at end of season) and open the pool and I would like to manage the pool going forward. Unfortunately, I was unsure of the exact chemicals and amounts used to open the pool on 6/1.

    Maintenance sheet from pool company on 6/1:
    FC: 3
    pH: 8+
    Alkalinity: 120
    Hardness: 260
    Stabilizer: 30

    Chemicals added (as noted on maintenance sheet):
    liquid chlorine: 5 gal
    pH Descreaser: 2 gal
    DE: 6 lbs

    On 6/4, used kit to determine presence of chlorine (1 FC & 1.5 CC) and pH (6.8). I added Borax and bleach according to the calculator to get a Shock FC = 10 and pH of 7.4. Unfortunately, I fell asleep before I could measure the chlorine.

    This mornings readings using TFT100:
    FC: 2.5
    CC: 3.0
    TC: 5.5
    pH: 7.4
    TA: 110
    CH: 340
    CYA: <20

    Based on these readings, I need to shock the pool (bleach) and perform the OCLT test. When should I add CYA? BTW, the pool water is clear and blue, not much different from when the cover was removed.
    22k gallon IG freeform plaster with Spa, A.O. Smith SQ1202 2HP Single Speed pump, Anthony VA-52 DE filter, Polaris 1-460-02 1HP Spa Blower, Raypak RP2100 400K, Caretaker 99

  2. Back To Top    #2
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: When to raise CYA?

    Welcome to the forum

    I suggest you raise CYA to about 30 for now. You can raise/fine tune CYA once the shock process is done.

    Congrats on your test kit and your knowledge


    Unfortunately, I fell asleep before I could measure the chlorine.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  3. Back To Top    #3

    Join Date
    May 2013
    Location
    Southeast PA
    Posts
    5

    Re: When to raise CYA?

    Thanks for the warm welcome and help.
    22k gallon IG freeform plaster with Spa, A.O. Smith SQ1202 2HP Single Speed pump, Anthony VA-52 DE filter, Polaris 1-460-02 1HP Spa Blower, Raypak RP2100 400K, Caretaker 99

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