Eliminator Ready-to-Use Weed & Grass Killer Herbicide 128 oz. Kills the root so weeds won't grow back! This formula is rainproof in 10 minutes and you'll see visible results in 3 hours. Be patient as you wait for the full results of killing unwanted weeds and grasses down to the root! A systemic weed and grass killer. The product enters the plants through the foliage and moves down to the roots systematically, thereby killing it. . Eliminator Weed & Grass Killer kills only what you spray. Any product not absorbed by the plant will be rendered inactive after it hits the soil. This product has no soil residual activity. Sprayed weeds and grasses wilt within 3 hours with complete kill in 1 to 2 weeks. Weeds die, roots and all, so they don't grow back. Be patient! It's working as you go about your life!