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Thread: New dark plaster having white spots

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    New dark plaster having white spots

    I had my pool refinished with a black finish over thanksgiving and slowly the pool finish is having white streaks
    I put the anti scale agent every 3 weeks and I followed the instructions from the pool folks who did the install.

    However they are advising me since the pool is new that PH 7.6 is to high and to keep it at 7.2

    I check my water 2 times a week and it’s around 7.5-7.6 and everything else is normal


    Here are the feb numbers
    Where there is an x I didn’t perform the test


    2/4
    6.5 chlorine
    325 calcium
    90 Ta
    45 cya
    7.8 ph

    2/7
    5.5
    X
    90
    X
    7.5

    2/11
    6
    275
    80
    X
    7.6

    2/14
    4.5
    X
    70
    X
    7.6

    Would the PH really have an impact on scaling? And if so is my ph to high?89672146-DDF2-4AFF-B728-FFCB2D4E0E76.jpeg
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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    Mod Squad mknauss's Avatar
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    Re: New dark plaster having white spots

    pH has a significant impact on scaling - see Pool School - Calcium Scaling

    However, a number of posts on this forum have shown that dark plaster has extensive 'mottling' and is subject to noticeable imperfections.

    From your tests I do not see an issue with your CSI. Do you track that parameter? It is calculated in PoolMath and in the App.

    Take care.
    6000 Gallon IG Fiberglass with integrated Spa;Pentair CCP240 Cartridge Filter with Pentair Intelliflo VS Pump and HTR250 heater. IC40 SWG. EasyTouch 4. Dolphin Active20 Robot "Roadrunner", TF 100 Test Kit w/SpeedStir!
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    Marty

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    Re: New dark plaster having white spots

    Quote Originally Posted by mknauss View Post
    pH has a significant impact on scaling - see Pool School - Calcium Scaling

    However, a number of posts on this forum have shown that dark plaster has extensive 'mottling' and is subject to noticeable imperfections.

    From your tests I do not see an issue with your CSI. Do you track that parameter? It is calculated in PoolMath and in the App.

    Take care.

    I am inputting the test values from the pool kit from troublefreepool store and entering them in the poolmath website

    I do my tests on Wednesday and Saturday/Sunday

    I scrub the pool floor and walls twice a week
    I vacuum the pool on the weekend and clean he filter on the weekend
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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    Mod Squad mknauss's Avatar
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    Re: New dark plaster having white spots

    With new plaster you should be testing pH every day. That way your pH does not swing high/low/high.

    - - - Updated - - -

    How do you chlorinate?
    6000 Gallon IG Fiberglass with integrated Spa;Pentair CCP240 Cartridge Filter with Pentair Intelliflo VS Pump and HTR250 heater. IC40 SWG. EasyTouch 4. Dolphin Active20 Robot "Roadrunner", TF 100 Test Kit w/SpeedStir!
    CLICK HERE to Become a TroubleFreePool.com Supporter!! Pool Math App
    Marty

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    Re: New dark plaster having white spots

    Quote Originally Posted by mknauss View Post
    With new plaster you should be testing pH every day. That way your pH does not swing high/low/high.

    - - - Updated - - -

    How do you chlorinate?
    I tested the pool every day for the first month

    But looking at my data is it swinging wildly?

    I am using liquid chlorine to reach the level recommended by the poolmath and I have a puck and it’s set at 1.5

    I can start testing the ph daily and see how much it’s changing
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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    Mod Squad YippeeSkippy's Avatar
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    Re: New dark plaster having white spots

    Are you using muriatic acid to lower your pH when it rises? Don't use dry acid-not recommended as good for plaster or SWCGs.

    Maddie
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: New dark plaster having white spots

    Quote Originally Posted by YippeeSkippy View Post
    Are you using muriatic acid to lower your pH when it rises? Don't use dry acid-not recommended as good for plaster or SWCGs.

    Maddie
    Iím using muriatic acid
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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    jeffchap's Avatar
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    Re: New dark plaster having white spots

    My pool is fairly dark and when I purchased it, it had a good number of white spots (or small white nodules) all over the bottom and sides. There were also some white streaks similar to what I see in your picture.





    On a whim, I picked up a potato shaped pumice looking rock from the flower bed and tried scraping off one of the spots. It worked great, and didn't leave any marks on the pool itself. So my OCD kicked in and I spent the next several evenings scraping every spot and streak off that I could reach (I'm going to need some scuba gear to finish the job). But I'd guess that 90% of all the white came off and it looks much better now.





    From what I've read, these spots are due to calcium from the surrounding soil leaching back through imperfections into the pool. Your problem may not be the same, but I thought I'd throw this out there as something to try.
    25000 gallon free-form gunite
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    Pentair MasterTemp 250HD heater
    Jandy AquaLink RS automation

  9. Back To Top    #9

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    Re: New dark plaster having white spots

    The company that plastered my pool said the stucco dealer looked at the photos and said the following

    “calcium Scale Plated Out, hit it with the Jacks Number 2 treatment, but wait until the water warms up or it won't work".

    I am dumbfounded tho as the CH was at or below 325. And ph within normal levels

    I am wary of draining and acid wash since I don’t know how to prevent it again.

    I was thinking of lowering ph to 6.8
    Then use steel brush alongside pulmice stone to remove scaling

    Is that idea sound?
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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