Crystal Blue Copper Sulfate Smart Crystals Moss & Algae Killer, 15 lb. is designed to effectively control most types of algae in ponds and water bodies. This product versatile application methods, including casting copper crystals directly over floating algae mats, dissolving them in water for spraying, or placing crystals in a porous bag to drag behind a boat. It is to treat a portion of the pond at a time to prevent oxygen depletion and maintain a healthy aquatic environment. The product comes in a convenient, ready-to-use 15 lb. pour container, capable of covering up to 6 acres at a depth of 1 foot. This makes it an efficient and practical solution for managing moss and algae growth. Model Number: