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Thread: 7 month old replaster

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    Join Date
    Apr 2014
    Location
    Bakersfield, California
    Posts
    24

    7 month old replaster

    Okay, so after 7 months of replastering pool with dark gray color quartz and using BBB method religiously, i am starting to see whitish marks at bottom of pool. My CSI has always been maintained around -0.3 to -0.1.

    My water balance has been steady and averaging the following during the first 7 months:

    FC=4.0
    PH= 7.5
    TA=60 - 80
    CYA=60
    CH=300-400

    My current readings are as follows:

    FC=3.0
    PH=7.4
    TA=60
    CYA=40
    CH=500

    Could the white marks be calcium scaling? My CSI average does not indicate that scaling would develop.

    Would CH at 500 cause scaling?
    Should i drain water?

    Is there any other way of removing calcium scaling without draining pool?
    20K gal colorscapes dark gray plaster, no SWG, BBB method, variable speed hayward ecostar pump, pentair cartridge filter, hayward navigator cleaner.

  2. Back To Top    #2
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    7 month old replaster

    Usually you get scaling when your PH is too high. Your PH looks fine. Your CH is a tad high, but with keeping PH in check that should prevent scaling I would think. Not sure what the white spots could be. Could you post a picture of them ? There is an article in pool school on calcium scaling.
    On another note your FC is at the min for your CYA level. Your target should be 7 and never below 3. When your CYA level was 60 your target FC should be 9 and never below 5. Just a heads up. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Join Date
    Jul 2012
    Location
    Central Texas
    Posts
    436

    Re: 7 month old replaster

    Is it possible that you have some micro fractures in the plaster? Water seeping in behind them and 'eating' the readily available calcium on the underside could produce some white streaks like that. That happened in mine, although the the paster was 2 years old, not 7 months.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    Join Date
    Apr 2014
    Location
    Bakersfield, California
    Posts
    24

    Re: 7 month old replaster

    how do i perform a no drain acid wash? would this be an effective option in an attempt to remove calcium scaling on 7 month old plaster?
    20K gal colorscapes dark gray plaster, no SWG, BBB method, variable speed hayward ecostar pump, pentair cartridge filter, hayward navigator cleaner.

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

    Re: 7 month old replaster

    When the scaling is localized, which it sounds like your is, you don't want to do a no drain acid wash, as it will damage the plaster everywhere that there isn't scaling. If it is very localized, you can use a PVC pipe to direct acid directly to the spots that are stained/scaled, though this gets very tedious if the scaling is more extensive.

    With CH at 500, it doesn't take too much inattention for the PH to go up, which can sometime result in scaling, even if the periods of high PH are very short.
    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

  6. Back To Top    #6

    Join Date
    Apr 2014
    Location
    Bakersfield, California
    Posts
    24

    Re: 7 month old replaster

    what do you recommend? i am leaning towards draining pool to remove high CH. Plaster is fairly new and worried about any acid wash treatment causing more damage than good.
    20K gal colorscapes dark gray plaster, no SWG, BBB method, variable speed hayward ecostar pump, pentair cartridge filter, hayward navigator cleaner.

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