From the Manufacturer
One formula kills Moss and Algae wherever it grows. Treats lawns, patios PLUS roofs and buildings. With other brands you’d need two formulas to treat all areas. Kills: Moss, Algae, Lichen. Where to Use: Lawns, decks, patios, fences, mulch, driveways, gravel, roofs and buildings. When to Use: Anytime during the year. Active Ingredients: Potassium soap of fatty acids: 22.11%.