Corry's Moss B Ware is a granular moss killer designed to eliminate and prevent damaging moss on roofs, patios, and walkways for up to two years. The 11-pound container covers up to 11,000 square feet and can be applied directly from the shaker container along roof ridges or dissolved in water for spray application using a sprinkling can or pump-up sprayer. Safe for use on wood, composition, concrete, and metal surfaces including roofs, it won't stain roofs or corrode aluminum and galvanized gutters when used as directed.

The product works by destroying existing moss and preventing new growth, helping extend the life of roofs and improve the condition of outdoor surfaces. For killing existing moss, pitched roofs can be treated by shaking granules along the ridge, allowing rain to wash the product through lower moss patches. Flat roofs, patios, and walkways are best treated with liquid application. Dead moss can be swept away after treatment. For prevention only, use at a rate of one pound per 1,000 square feet, which may require annual applications. Active ingredient is zinc sulfate monohydrate.