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Thread: What's this on my tile?

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    What's this on my tile?

    Pool installed last year. Most of the pool tile looks fine with exception of these two spots. I've tried scrubbing these areas with pumice stone and it helps to clean it up. But continues to come back, even during really​ dry winter. Tile line remains clean so don't think this is scaling. Is this efflorescence or something else? Any suggestions on how to treat area so it doesn't come back?








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    Mod Squad kimkats's Avatar
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    Re: What's this on my tile?

    It is efflorescence. It is easy to clean but it is almost impossible to stop from coming back.

    Cleaning-muratic acid 1 to 4 water. Remember that m.a. lowers PH but I don't think you will be using that much so it should not be a big worry.

    Do you have any pics of your build in those areas? Can you tell what is behind those areas? IF you can figure out what is back there you might be able to dig to that area and water proof it so stop the moisture from pushing through to the tile.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: What's this on my tile?

    That area has the pool wall and then wall for enclosure footer with fill between. Here's picture from​ the build.



    And here is currently (problem areas are too the left of each of the shear descents).


    The winter here has been REALLY dry (only a couple of inches of rain since November) so I thought that, if this was efflorescence it wouldn't show up with the dry conditions. Just strange it's only in those two areas.


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    Mod Squad kimkats's Avatar
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    Re: What's this on my tile?

    Interesting they are both to the left of the sheers.............Go look at your build pics real close.........could the sheers or water supply for the sheers be causing that? It is equal distance from each sheer for both spots?

    Just thinking out loud up there.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: What's this on my tile?

    Good thought. The problem areas are different distance from the descents. I've also had the descents off since early November so no water supply to those for months. With dry winter and no water to the descents it had me really wondering why I'd have efflorescence showing up still. I thought maybe leakage from pool shell, but pool itself is holding water level relatively steady, only had drop of 4 inches or so in 5 months along with 2 inches of rain. Must be moisture coming from somewhere.
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    Re: What's this on my tile?

    Rainwater could be seeping through your tile decking and then down to the substrate underneath. For some reason the path of least resistance is for that water to continue downward and finally go through your pool tile.

    I would've suspected a leak in the supply to the sheers but you say they have been off.

    Efflorescence eventually goes away as the mineral supply gets used up. It may take a long time, though.

    Clean it with muriatic and observe it
    Dave S.
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    Re: What's this on my tile?

    Thanks to both Kim and Duraleigh. Is there concern with putting the diluted MA solution on the grout? I'm not concerned with a little extra MA in my pool, I'm dropping in about a cup a week as pH continues to run up to 8+ each test.
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    Mod Squad kimkats's Avatar
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    Re: What's this on my tile?

    If you rinse it very well it should be find. You can also use a cloth to rub the m.a. on just the tile. It will take longer but if you are worried this will help ease your mind.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: What's this on my tile?

    Thanks Kim.
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    Re: What's this on my tile?

    The plants behind the birdcage get watered, right? Could the sprinkler be soaking the ground there too much since its fairly close to the pool edge?

    Just wondering....

    Yippee
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    Re: What's this on my tile?

    That close up of your grout indicates it needs whitening. The muriatic may do that anyway or you may have to clean it with detergent to get a color match. Just rinse the tile/grout off right away and it'll be fine.

    The muriatic will also eat just about any cloth you use. I have used a "deck brush" that is acid proof.
    Dave S.
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    Re: What's this on my tile?

    Quote Originally Posted by YippeeSkippy View Post
    The plants behind the birdcage get watered, right? Could the sprinkler be soaking the ground there too much since its fairly close to the pool edge?

    Just wondering....

    Yippee
    Hmmm.... I don't think so, the sprinkler for plants is a drip line. There's two concrete walls that water would have to pass through, the outer footer wall and the pool wall. Ground there is not saturated by checking soil around plants.

    - - - Updated - - -

    Quote Originally Posted by duraleigh View Post
    That close up of your grout indicates it needs whitening. The muriatic may do that anyway or you may have to clean it with detergent to get a color match. Just rinse the tile/grout off right away and it'll be fine.

    The muriatic will also eat just about any cloth you use. I have used a "deck brush" that is acid proof.
    The grout is not white, it's a beige color to tie in with the pavers. I do need to get into the pool and get a brush to the grout, hopefully water gets warm enough here in next couple weeks.
    Free Form 13K IG (Quartz) w/Screen Enclosure - 2 Sheer Descents, 1 Bubbler - Hayward 60 SF DE Sta-Rite - Hayward SP3400VSP EcoStar - Hayward Aqua Rite AQR9 (T-Cell-9) SWG - Zodiac MX6 - July 2016 - Taylor K-2006 - Taylor K-1766 Salt Test

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