Eliminator Weed & Grass Killer Concentrate Herbicide 16 oz., kills the root so weeds won't grow back! This formula is rainproof in 30 minutes and you'll see visible results in 12 hours. Eliminator Weed & Grass Killer Plus Concentrate is a systemic weed and grass killer. The product enters the plants through the foliage and moves down to the roots systematically, thereby killing it. Weeds die, roots and all, so they don't grow back. Sprayed weeds and grasses wilt within 12 hours with complete kill in 1 to 2 weeks. Be patient! It's working as you go about your life! Eliminator Weed & Grass Killer Concentrate Herbicide 16 oz., weight 1.48 lb.