Bayer Advanced™ 704370A DuraZone® Weed & Grass Killer, Ready-To-Use, 1.3 GallonKills & prevents new weeds & grasses. Just one application of Bayer Advanced DuraZone Ready to Use Weed & Grass Killer kills existing weeds & grasses PLUS prevents new weeds & grasses up to 6 months. Apply it to the entire zone you want protected against weeds, not just the emerged weeds creating a weed prevention barrier that continues working for up to 6 months so you dont have to. Controlling weeds in your landscape has never been easier. Size: 1.