BioAdvanced 2-in-1 Moss and Algae Killer and Cleaner uses one formula to kill moss and algae wherever it grows. The 2-in-1 non-bleach formula kills moss, algae, lichen, mold, and mildew and will not stain or harm lawns. It works to kill within hours. The moss will quickly turn yellow, then brown and can be washed away by hand or by rain. With just one application, it protects for up to one year and can be used on lawns, patios, roofs, buildings, decks, driveways, and more. The ready-to-spray applicator is easy to use. Simply attached the product to your garden hose, turn on the water, and use your thumb to activate the sprayer. BioADvanced 2-in-1 Moss and Algae Killer and Cleaner measures 32-ounces and treats up to 500 square feet. Active Ingredients: 22.1% fatty acid formula. EPA Registration Number: 67702-12-92564.