How to identify Efflorescence Stains
Common locations: Efflorescence (sometimes referred to as ‘salt deposits’), can be found on internal and external brick, tile or concrete walls or floors.
Appearance: A white, loose, powdery substance. Will often disappear when wet, but reappears after the surface has dried.
Cause: Salts can form in bricks, concrete and mortar joints if moisture is present. These salts then react with the lime component in the mortar or concrete. As the moisture evaporates, the white, unattractive crystalline salt stains form on the surface.