Krud Kutter CE326 32-Ounce Concrete Clean and Etch;

Much safer than muriatic acid using a phosphoric acid base. Designed for cleaning, degreasing, and acid etching concrete. Applications to clean and prepare concrete, masonry, and brick for coating, staining, or sealing. One gallon will cover 800 square feet. Ideal for cleaning, degreasing, and acid etching concrete floors, walls, basements, driveways, swimming pools, patios, and containment areas prior to coating or sealing. Can also be used to remove efflorescence and to neutralize new concrete and new mortar joints. Water-based. Biodegradable. Odorless. Non-flammable.