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Thread: What's This on My Plaster?

  1. Back To Top    #1

    Join Date
    Mar 2011
    Location
    Houston, Texas
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    What's This on My Plaster?

    In the last couple of weeks I've noticed some splotches on the bottom of my pool--mainly on some of the steps and in the shallow end. They could have been there longer or just not as noticable. Please see the attached photo. It's the lighter colored sort of round marks. They don't come off with a steel brush and they seem to be in the plaster itself. I know that it's common for Luna Quartz to have imperfections and perhaps that's all this is. The Luna Quartz is still young--about six months old. I'm still adding about a gallon of MA each week to keep the pH in the 7.5 range. The water is very clear and blue. Here are this morning's test results from my TF-100:

    FC 4.5
    CC 0.0
    pH 7.2-7.5 (added 1/2 gallon of acid yesterday morning; it will be back up to 7.8-8.2 in a few days)
    TA 90 (I'm trying to get it lower; it's hard with 200+ TA fill water and no rain)
    CA 480 (two pool stores put it more like 300)
    Salt 3600
    CYA 60 (I know it needs to be closer to 80)
    Borates 80

    Any ideas as to what this could be?[attachment=0:3bulrxfw]Pool Pic 1.pdf[/attachment:3bulrxfw]
    Attached Files Attached Files
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    poolgirl22's Avatar
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    Apr 2010
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    Stephens City, VA
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    Re: What's This on My Plaster?

    I can't address the original question as I'm not familiar with that surface type. However, on first very quick glance as I'm walking out the door... part of the increases in Ph are related to the fountains. Fountains aerate the water. Aeration of water raises Ph.

    Try shutting the fountains down and see if the ph holds longer.

    I'm sure another member can address the picture/question.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

  3. Back To Top    #3

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    Re: What's This on My Plaster?

    Thanks. We rarely run the fountains--maybe three times since the pool was finished in early December 2010 and only for a few minutes each time. I think the spillover spa, the 2 hp pump, the highish TA, and the SWG all contribute to the rising pH.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

  4. Back To Top    #4

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    Mar 2011
    Location
    Houston, Texas
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    Re: What's This on My Plaster?

    Any ideas anyone?
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

  5. Back To Top    #5

    In the Industry

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    Re: What's This on My Plaster?

    Just looks like motting or changes in the plaster color. Is it smooth or raised. If smooth it;s just color change.
    25k 20x40 Gunite w/ integrated Spa & Caribbean Blue Plaster, Curved Bluestone Coping, Deck Jets
    Pentair Easy Touch/Wireless, Sta-Rite Intellipro SRVS Pump, Intellibrite Lights, & Pentair IC40 Cell, Sta-Rite 450sf Cartridge filter
    Heated from Central Boiler - Outdoor Wood Furnace & Triangle Tube Max Heat Exchanger
    ColorQ Pro
    TF-100

  6. Back To Top    #6

    Join Date
    Mar 2011
    Location
    Houston, Texas
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    413

    Re: What's This on My Plaster?

    It's smooth, just like the entire surface of the plaster.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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