Anti-Creo-Soot (ACS) Creosote Removal Products are environmentally safe, non-toxic liquid catalysts that modify dangerous creosote. For maximum effectiveness, spray daily into the firebox and on the wood during low fire conditions to convert the creosote to harmless ash. ACS improves combustion and promotes cleaner burns, which makes it an important part of any wood burning maintenance program, and also reduces ash and clogging in pellet stoves. ACS is safe to use in appliances with catalytic combustors, and should never be used as an alternative to chimney cleaning. Not for use on lightweight fiber logs or white birch log sets. It is easy to use and cleans up logs in a snap!