Gonzo Odor Eliminator for Basements and Garages is an all-natural, odorless, non-toxic solution for unpleasant must and mildew odors. These volcanic crystals contain an electrical charge that acts as a magnet to attract and hold unpleasant airborne odors. Keeps your home smelling fresh and clean. Does not contain perfumes or fragrances and is environmentally safe for you and your pets! 1 bag. I bag will be effective in an area up to 600 square feet.