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  • Defining Efflorescence and Calcium Deposits

    First let’s define efflorescence and calcium deposits. Efflorescence is a deposit of a salt that collects on the outside of a material’s surface. Calcium deposits, also referred to as lime buildup, accumulates right below a material’s surface. Both conditions occur when evaporating water pushes minerals in the material towards the surface and can be indicators of water damage.

    Physical Characteristics

    Efflorescence, a porous substance, looks white and chalky. Since it rests on the surface of a material, efflorescence will darken when splashed with water. Calcium deposits are denser than efflorescence and usually appear as white streaks running down a material’s surface. Because the calcium forms right below a material’s surface, water will not affect its appearance.

    How to Clean

    Both efflorescence and calcium deposits can be cleaned using a 50/50 mix of white vinegar and water. Using a scrub brush, spot treat affected areas with the vinegar mix. The acidity in the vinegar helps remove the efflorescence and calcium deposits by breaking down mineral crystals. After cleaning the surface, let dry for 48-72 hours (moisture content below 25%).

    Often efflorescence and calcium deposits can be removed without compromising the structure of the material. However, if there is excessive mineral loss the material can become brittle so make sure to replace the surface if this occurs.

    How to Prevent

    There are two ways to help ensure that the efflorescence and calcium desposits do not come back. The first is to seal the surface with one coat of RainguardPro Efflorescence Blocker. It works on above and below grade projects to block minerals and alkali from coming up to the surface. Efflorescence Blocker is great for surfaces where waterproofing membranes have failed. The second way to prevent efflorescence is to apply two coats of a penetrating Silane / Siloxane water repellent such as RainguardPro’s Micro-Seal®.

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