Safer brand moss and algae killer is ideal to use on roofs decks siding walkways home greenhouses and growingcontainersIt eliminates mosses algae lichens liverworts and grime, Ready to spray, Treats up to 500 square feet, Make sure knob is twisted fully clockwise to off position shake well before attaching to hose, 2% Herbicdal Soap (Potassium Salt Of Fatty Acids), Dimensions (L x W x H):3, 07 x 5, 15 x 10, 81 SKU: BCI03296