Boardwalk Super Block Deodorizer is a powerful, solid, 20 lb, air freshening block. The strong deodorizer is ideal for the most unpleasant smelling environments, such as dumpster areas, water treatment facilities, garbage collection areas, elevator shafts, and sewers. The powerful cherry fragrance fights odors up to 14 weeks. Made from pure paradichlorobenzene thats encased in a mesh sack for hanging.