Helps keep your chimney flue cleaner when used regularly. Inhibits the rate of creosote build-up and reacts with most chimney deposits to reduce adhesiveness. The tightly compressed firelog contains special chemicals that will destroy built-up creosote and help prevent further creosote build-up. Made from 100% all natural wood. Contains no waxes or oils and burns like cordwood. Simply add 1-piece to an active fire and keep fire burning until firebrick has been consumed. Not to be used on creosote built-up greater than 1/4" For use in wood stoves and fireplaces.