The 10 lb. bag treats 10,000 square feet, and the 20 lb. bag treats up to 20,000 square feet. Use a push or handheld spreader to apply these granules evenly at a rate of 1.2 pounds per 500 square feet. Lightly water the treated area immediately after application to aid in control. Consult the label for spreader direction and recommend the spreader should always be calibrated according to manufacturing guidelines.