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Thread: Constantly rising pH

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    Join Date
    Jun 2013
    Location
    Mountain House, CA
    Posts
    4

    Constantly rising pH

    We have a new build (June), plaster pool, with SWG and waterfall from spa. I am having a hard time keeping the pH under 8. It feels like I'm always adding acid. I think I need to add stabilizer, but wanted to post my test results and see what order I should try to correct things.

    FC 4
    TC 4
    pH 8
    TA 90
    CH 370
    CYA 50

    My test kit is a fairly comprehensive Taylor kit. So should I just keep adding acid, or do I need to do something else first?

    TIA!

    Carley
    15K gal IG Pebble Sheen pool, Hayward Ecostar VS 2.0 HP pump
    Hayward Swimclear Cartridge filter C4030, 150 GPM
    spa/SWG/ECommand 4 finished 6/7/13

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Constantly rising pH

    Fresh plaster will raise the PH, TA, & CH levels rapidly for the first month and more slowly for up to a year. This is a side effect of the plaster curing. You will also be seeing some PH increase because TA is above 70 and CYA is below 70. There is nothing to be done about the plaster curing, that will continue until it is done. But you can reduce the PH drift from high TA and low CYA.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    Feb 2008
    Location
    Denton, TX
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    5,061

    Re: Constantly rising pH

    Another component of your high pH issues has to do with the fact that you are running an SWCG. Even after your plaster has cured, you will be contending with pH rise because of the mere fact that you are operating your SWCG. It won't be near to the degree that you are chasing it from the plaster curing but you will be adding rather frequently.

  4. Back To Top    #4

    Join Date
    Jun 2013
    Location
    Mountain House, CA
    Posts
    4

    Re: Constantly rising pH

    Do I need to bring my CYA up?
    15K gal IG Pebble Sheen pool, Hayward Ecostar VS 2.0 HP pump
    Hayward Swimclear Cartridge filter C4030, 150 GPM
    spa/SWG/ECommand 4 finished 6/7/13

  5. Back To Top    #5

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Constantly rising pH

    We recommend that SWCG pools maintain a CYA level between 60 and 80 ppm.

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