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Thread: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remove

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    Join Date
    Jul 2014
    Location
    Spanish Fort AL
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    2

    Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remove

    I'm new to the forum, thanks for advice in advance.

    I have a retaining wall on one side of the pool. It has a flagstone face and I'm getting a little weaping of moisture and a build up of limescale or whatever the white mineral build up is. I've attached a picture to show the problem. Any ideas on how to address this? I've tried pool store scale removers, CLR and diluted MA with no luck. I literally have to scrape the rock like build up with a scraper and then use a pumice stone on the tiles. Just not sure what to use on the flagstone.WP_20140720_001.jpg

    WP_20140720_002.jpg

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    Re: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remov

    Is there groundwater behind the wall?

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    wellsnlisa's Avatar
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    May 2014
    Location
    Cypress, Texas
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    47

    Re: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remov

    Do you have one of the recommended kits? Can you post a full set of test results? I had something similar on a stacked stone wall where our spa spilled over into the pool. It turned out our calcium hardness level was way too low for a plaster pool. The water was leaching calcium from the stone. I cleaned it off with a stiff plastic bristle brush and a 3 parts water to one part muratic acid solution, rinsing often. Then I added enough calcium to bring the water's CH up to recommended levels for a plaster pool. (I used Pellets of Fire ice melt that I ordered from Amazon.). It never came back.
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    Join Date
    Jul 2014
    Location
    Spanish Fort AL
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    Re: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remov

    yes, we just had a lot of rain so it's a little worse than usual

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    Re: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remov

    I think that it's efflorescence due to ground water seeping through the wall. The solution would be to improve drainage to prevent excess ground-water behind the wall.

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    First Pool Judith's Avatar
    Join Date
    Feb 2014
    Location
    Georgetown, Texas
    Posts
    57

    Re: Is this limescale, calcium, spalling, efflorvescence on flagstone? How do I remov

    I had some calcium leaching (not as much) on a couple of flagstones along the edge of the pool. I used a pumice stone to scrape it and then a 5" stainless steel brush. It came off very quickly and easily.
    Judith and Brian D
    16,000 gal; IG Quartscape; Cartridge Jandy CV460 (150 gpm Max); Jandy Pro 2.0 Variable
    Polaris PB460 3/4 booster; Polaris 280 Cleaner; In Line Chlorinator Tri-Chlor (don't use it) Ozonator
    Fill Date 11/11/2013

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