SCR is a concentrated combination of three commercial grade prep products, in one environmentally safe solution. SCR utilizes a detergent, degreaser, and hydrochloric acid to clean and prepare concrete for overlays, stains, sealers and coatings. SCR’s formula quickly dissolves mortar, scale, rust, algae, stains and mineral deposits such as efflorescence. SCR is a stronger cleaner then citric acid and a safe alternative to muriatic acid, as it contains no toxic heavy metals or ozone-depleting solvents. Mix up to 4:1 with water for 750 sq ft of coverage.