Use in airtight stoves and fireplace inserts. Changes creosote into brushable powder. Makes fires burn cleaner. Improves efficiency of the stove or insert. Reduces danger of chimney fires. Solid granular material that is activated by heat. Modifes creosote by changing it from a sticky tar like material to a loose powdery non-adhering deposit that can be brushed away. Apply twice weekly for the first month. Apply weekly for continuous use. Safe to use in all types of chimneys.