Complete-WK is an EPA registered, specially formulated, nonselective herbicide that offers total kill control over a wide variety of annual and perennial weeds and grasses. It also offers residual action, making it the perfect herbicide for long-lasting weed control or as a semi soil sterilant. CWK will kill any and all types of weeds and grasses for up to 6 months. When used as a soil sterilant, nothing will grow in the treated as with traditional weed killers, and you will see results in as little as 24 hours.