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Thread: limestone leaching up from concrete under paver

  1. Back To Top    #1

    Join Date
    Mar 2009
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    Charlotte, NC
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    530

    limestone leaching up from concrete under paver

    About the only section on the forum to ask:

    Apparently there is “limestone” (what I was told) leaching up from concrete (or something) under brick pavers into a door’s metal threshold area; the metal threshold butts up against these outside brick pavers. Is there a decent (safe, cheap, etc) chemical to eat it away/ clean it nicely. Carbonic acid? Vinegar/ acetic acid/ HCl/ muriatic acid. Almost every type of acid dissolves limestone, what would you suggest?

    http://glenwoodcaverns.com/pdfs/Dissolv ... h-Acid.pdf

    And if I don't see an immediate reaction then ok to letit dwell a while I assume.

    I understand it takes water pooling in the area to create this “leaching limestone” problem So solving that drainage issue is a priority.

    Thanks
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
    Pentair Whisper Flow Pump 1HP. Winter safety cover w anchors.
    Sand filter, Pentair Sand Dollar Top Mount Model SD80; Effective Filtration Area 3.5SF
    - FlowRate 75GPM, 8Hr 36,000, 10Hr 45,000, 12Hr 54,000; Pressure Weight 50PSI
    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

  2. Back To Top    #2

    Join Date
    Mar 2009
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    Charlotte, NC
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    530

    Re: limestone leaching up from concrete under paver

    ChemGeek was kind enough to send me the below:
    This sounds like it could be efflorescence....
    http://en.wikipedia.org/wiki/Efflorescence

    Though acid may clean it, you might have to have some sort of seal to prevent more water from migrating from under the concrete.

    You should also post this question on the forum since others are better experts at this than I am.
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
    Pentair Whisper Flow Pump 1HP. Winter safety cover w anchors.
    Sand filter, Pentair Sand Dollar Top Mount Model SD80; Effective Filtration Area 3.5SF
    - FlowRate 75GPM, 8Hr 36,000, 10Hr 45,000, 12Hr 54,000; Pressure Weight 50PSI
    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

  3. Back To Top    #3
    solarboy's Avatar
    Join Date
    Aug 2010
    Location
    Europe
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    337

    Re: limestone leaching up from concrete under paver

    This is usually caused by salts below leaching up. It is usually excluded from guarantees. The usual advice is just to wait for it to go away.
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

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