This super-absorbent crystal Gel continuously releases Fresh Wave's powerful plant oil blend into the air, neutralizing odor molecules as it evaporates. Place in basements, kitchens, bathrooms, and kids' rooms. Tuck away on bookshelves, cabinets, closets, and trash canisters. Each 15 oz. Gel lasts about 30-60 days. This Safer Choice labeled product meets the EPA’s safer product standards.