Lilly Miller® 100099153 Moss Out® for Roofs & Structures, 6 LbKills moss quickly on roofs, patios, sidewalks, brick, and unpainted cement. This product is non staining and non corrosive to galvanized gutters. Use this product either wet or dry. This product covers up to 4,000 square feet. Controlling moss may add months, or years, of service to roofs, patios and such areas. Size: 6 lbs Covers up to 4,000 sq. ft. Exclusive Micro Granule Formula Kills Moss Quickly! On Roofs, Patios, Sidewalks, Brick, and Unpainted