The Chimney Sweeping Log contains a mixture of special minerals that coat and adhere to the creosote in your chimney. The minerals have a catalytic action causing the creosote to dry and become brittle. The catalytic action continues over the next 1-2 weeks while you are using your fireplace. The CSL minerals are working to reduce the tar and creosote. The potential for a chimney fire diminishes. Make your next fire safer!