100% air activated. Won't dissolve in water so all its fragrance goes into the air not the water. Lasts for 30 days consistently. Works great in high, medium or low traffic areas. No filler materials. Dyed to match the fragrance. Perfect deodorant powerhouse for sewers, elevator shafts, dumpster areas, garbage collection areas, water treatment facilities. Unique mesh hanger, safe for easy hanging. Fights odors up to 14 weeks. 2/cs