CERACID 8210 is a premium performing efflorescence and grout film remover for residential, commercial, and industrial ceramic tile, clay tile, and porcelain tile installations. This product is formulated to remove grout film and efflorescence remaining after new installations. It can also be used on old installations to remove effloresence emerging from soluble calcium salts appearing on the surface. USES For interior and exterior use. For floors, walls, masonry, and brick veneer cladding.