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Thread: PH and Closing

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    North East
    Posts
    135

    PH and Closing

    Hey all,

    After a great season, the time to close is quickly approaching here in Pa. Last year, the PH rose to over 8.0 during the off season and caused scaling issues (see my other threads if interested).

    How do I prevent this from happening during the off season when the pool is closed?

    Thanks all,

    Hope you've had a great pool season!
    25,000 gallon Concrete/Plaster Pool
    Pentair WFDS-26 - Installed Spring 2012
    Pentair Quad DE 100 - Installed Spring 2012
    Pentair Kreepy Krauly 820 - In Service 05/26/2013
    K-2006 Test kit, Intermatic P1353me Digital Timer, Stenner 85MHP5

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,083

    Re: PH and Closing

    I don't close my pool so I can only guess. Lower the pH to 7.2 prior to closing and, oce it's covered, I suspect the outgassing of CO2 (which causes the pH rise) will be greatly reduced. So much so that I think you will stay below pH 8.

    What is your CH and your TA?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Jul 2011
    Location
    North East
    Posts
    135

    Re: PH and Closing

    FC: 11
    CC: 0
    PH: 7
    TA: 80
    CH: 350
    CYA: 25

    PH was high this morning so I brought it down. Everything look right? The pool is being closed this afternoon so is there anything I need to adjust? any last minute recommendations?

    Thanks all!
    25,000 gallon Concrete/Plaster Pool
    Pentair WFDS-26 - Installed Spring 2012
    Pentair Quad DE 100 - Installed Spring 2012
    Pentair Kreepy Krauly 820 - In Service 05/26/2013
    K-2006 Test kit, Intermatic P1353me Digital Timer, Stenner 85MHP5

  4. Back To Top    #4

    Join Date
    Jul 2011
    Location
    North East
    Posts
    135

    Re: PH and Closing

    did the numbers look ok?

    bueler?
    25,000 gallon Concrete/Plaster Pool
    Pentair WFDS-26 - Installed Spring 2012
    Pentair Quad DE 100 - Installed Spring 2012
    Pentair Kreepy Krauly 820 - In Service 05/26/2013
    K-2006 Test kit, Intermatic P1353me Digital Timer, Stenner 85MHP5

  5. Back To Top    #5
    UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,589

    Re: PH and Closing

    Quote Originally Posted by stslimited84
    FC: 11
    CC: 0
    PH: 7
    TA: 80
    CH: 350
    CYA: 25

    PH was high this morning so I brought it down. Everything look right? The pool is being closed this afternoon so is there anything I need to adjust? any last minute recommendations?
    pH seems a tad too low. I think that 7.2 is the lowest recommended.
    FC looks perfect.
    CC's look perfect.
    TA seems fine.
    CH - depends on everything else - I didn't run the numbers in Pool Calculator - have you? You'll need temp....
    CYA - is a bit low but no big deal since you'll (I assume) check again on opening.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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