Dont waste your money on ARREST I bought some last year sprayed just like the directions said. It killed grass for about 2 weeks then the grass come back thicker it acted more like fertilizer than weed killer!

How tall was the grass when you sprayed it? If it gets beyond a certain length (12" or so), the herbicide wont be as effective because the plant is pushing nutrients up to produce seed.

Sethoxydim is tried and true. It’s not a new product. Something went wrong with your application. Most likely multiple things.