Salt Abatement and Stain Removal
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The white powder that is often found on masonry is called efflorescence. It is almost always the result of too much water in a masonry wall. The water dissolves soluble salts which then migrate in liquid form towards the surface of the masonry where they dry and leave a fine white powder. This powder may or may not cause damage to the masonry. Sub-efflorescence is an extremely destructive form of efflorescence in which the soluble salts re-crystalize near the face of the masonry but below the surface. The re-crystallization causes the faces of brick and stone to sheer off leaving a damaged masonry unit.
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