Ortho 1 Gallon GroundClear Super Weed & Grass Killer RTU Refill. This quick kill formula effectively kills the toughest weeds to the root, making it perfect for patios, driveways, gravel, mulch gardens, and landscape beds. It kills small and large immature aggressive weeds with active ingredients Diquat dibromide 0.20%, Fluazifop-P-Butyl 0.07%, Dicamba, Dimethylamine salt 0.67%. It has a maximum coverage area of 350 sq. ft. and visible results in 24 hours. For spring/summer application.