Lilly Miller Moss Out for Roofs, Ready-To-Spray 27 oz. or 1.18 lb., is fast effortless way to kill on roofs and walkways. This formula contains soap salts that degrade quickly in the soil and do not persist in the environment. For best results, apply Moss Out to structures just prior to the time when fall rains begin or in early spring. Moss growth can occur in nearly any location where dampness persists. Such areas include roofs, decks, steps, patios, walks, fence posts, and foundations. Since moisture is essential, most moss growth appears during the fall, some in the winter and in the spring. Very little moss forms in summertime. Destroying existing moss is done most effectively during times when its growth is most rapid and when rain is not expected for several days. Controlling moss may add months, or years, of service to roofs, patios and such areas. Lilly Miller Moss Out for Roofs, Ready-To-Spray Non-stinging, non-corrosive formula can be used on roofs, concrete, asphalt, bricks and wood Contains soap salts that degrade quickly in the soil and do not persist in the environment Covers 500 sq ft Ideal use on roof structures, brick and unpainted cement work Kills Moss and Algae Ready-to-Spray Liquid Adjustable stream spray to reach roofs, decks and patios Non Corrosive to galvanized gutters For use Outdoor 27 oz.; Ready-to-Spray hose end Condition: New