What Causes White Deposits on Concrete Surfaces?
White deposits on concrete can make a driveway, path or patio look stained, chalky or uneven. They are often caused by efflorescence : a pale mineral residue left behind when water moves through concrete or nearby masonry, dissolves soluble salts and carries them to the surface. Once the water evaporates, the minerals remain visible. Efflorescence is common on many kinds of concrete, including concrete driveways, concrete paths, concrete crossovers, concrete slabs and