16 ounce 3X:Chemistry Refresh is an industrial strength odor encapsulator. Formulated as a semi-solid gel, Refresh uses charcoal to absorb offensive odors and neutralize air without perfumes or masking agents. Remove the lid, place the container in an air duct, lavatory, under a sink or on a shelf, and get 30 days of continuous odor control. Ideal for RV & marine winterizing and storage. Covers approximately 400-1,000 square feet for up to one month.