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Thread: High PH with cold water...spring opening.

  1. Back To Top    #1

    Join Date
    May 2013
    London Ontario, Canada 1hr NE of Detroit

    High PH with cold water...spring opening.

    Hi Folks;

    Just removed Loop-Lok cover last nite.

    Usual dark green swamp!!!

    This morning tests show high PH.

    The test #'s
    Temp: 52*
    FC: 0
    CC: 0
    TC: 0
    PH: 8.2
    TA: 50
    CH: Vinyl
    CYA: <20 (cloudy but can just see black dot)

    1. Is high PH caused by the cold water temp?
    2. Do I need to lower PH before starting to "Shock and Hold"?
    2. I use liquid Chlorine to open and shock, pucks for maintenance, so CYA slowly climbs thru the season(May-Sept. 1st.) do i need to raise the CYA
    before I start the "Shock and Hold"?

    Thanks again for the awesome resource this website and to it's Mod's and members.

    Have a Great Day,
    35,000 gal. Vinyl Liner I.G. pool @6yrs old.
    Pump: Jacuzzi. 1.5 HP
    Filter: Jacuzzi Laser250 w/6way valve, 350 lb, 8hr turn-over.
    Mesh Lop-Lok Cover
    TF-100 Test Kit - Pool School - Pool Calculator - Chlorine/CYA Chart
    Always use skimmer socks!!! Aquabot Turbo T.

  2. Back To Top    #2

    Join Date
    Jun 2013
    SpringHill FL

    Re: High PH with cold water...spring opening.

    Not positive on the temp diference for ph but i would lower it then go ahead and slam
    15x30 gunite 18k gallons Hayward star clear plus 120sqft cart

  3. Back To Top    #3

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

    Re: High PH with cold water...spring opening.

    1. Temp has little effect. You could always let sample warm to room temp for confirmation but it'll be close to the same.

    2. We call it SLAM, but yes

    3. I would say no. You want the CYA up to around 30 ppm to SLAM properly and the pucks will take too long for that to happen.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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