30 seconds Spray Walk Away Moss Algae Killer 30 seconds Spray Walk Away is specifically formulated to kill lichen, moss, mold, and algae. Ideal on roofs, pathways, sealed brickwork, asphalt, driveways, siding, wood decks, and other hard exterior surfaces. Safe for use around plants, gardens, and where children and animals play, when used as directed. One easy step, spray and walk away. No rinsing, scrubbing, hosing, or pressure washing needed. Mother Nature does all the work, eroding the treated matter while it decays over several weeks. Biodegradable. Bleach and phosphate free. Size 1 Gal., Concentrate or Ready To Use Concentrate, Application Type Pourable, Product Form Liquid, Coverage Area Varies According to Application, Active Ingredient Alkyl Dimethyl Benzyl Ammonium Chloride, Pkg Qty 1, Package Type Bottle