Glossary
Efflorescence
Definition
Efflorescence is the white, powdery mineral deposit that forms on brick, concrete, and pavers when water carries dissolved salts to the surface and evaporates.
It looks like a chalky haze and is often mistaken for a stain that pressure alone can fix. Plain water and brushing rarely clear it because the salts are mineral, not organic. A mild acidic efflorescence cleaner dissolves the deposit, after which the surface is rinsed and neutralized.
Efflorescence matters most before sealing. Sealing over it traps the haze and the moisture driving it, so pavers and concrete should be clear and dry before any sealer goes down.