These twin circular patios mirror one another.

Efflorescence is a naturally occurring substance that appears as a white, powderlike deposit on the face of some concrete, stone, and masonry products. It is caused by soluble salt deposits in either the construction material (bricks, concrete paving stones, mortar, etc.) or the backfill behind the material. Efflorescence often diminishes with time as the soluble salts naturally “sweat out” of the source. If the efflorescence does not wear off in an acceptable period of time, it can be removed by scrubbing with a dry, stiff-bristled brush, followed by flushing with clean water. There also are a number of cleaning products specifically formulated for use on concrete paving stones. Please consult your landscaping specialist to help determine the best way to handle any efflorescence that might appear on your concrete paving stone surface.