Weedol path & patio weed control refill pack is a ready to use and fast-acting weed killer. It controls a wide range of annual weeds and targets moss, with visible results in three hours, by creating an invisible barrier to prevent new weeds. Visible results in 3 hours. Kills weeds. Ideal for paths, drives and permeable patios. No glyphosate. For refill use with Power Sprayer pack.