Quikrete 8675-33 Efflorescence & Rust Remover, GallonRemoves efflorescence salts, rust and hard water deposits form horizontal and vertical concrete, pavers, brick, masonry and stucco surfaces. Renews concrete, masonry and paver surfaces. Solvent free. Apply at 100 200 sq ft per gallon coverage will depend on porosity of the surface. Highlights: Size : Gallon Use to remove efflorescence, rust and other stains from surfaces Ideal for use on concrete or paver patios and walkways, and masonry or stucco