Cutrine-Plus Granular Algaecide is one of the most popular algaecides on the market today. It is a double-chelated copper solution effective against a wide variety of algal species. Due to its double-chelate it stays in the water column longer, and in combination with its greater amount of activity in the plant can be much more effective. Active Ingredient: Copper as elemental 10.7% Basically, it is a copper-based algaecide and herbicide. It is applied to various types of water bodies to control filamentous and planktonic algae. It also controls the hydrilla plant and is safe to use in water bodies used for swimming and livestock.