Kanberra Gel 524001 Natural Air Purifier Gel Kanberra Gel is an all-natural proprietary blend of Pure Australian Tea Tree Oils When used, Kanberra Gel allows the natural antibacterial properties of the tea tree oils to become airborne through evaporative release Air movement over the jar takes TTO airborne to attack mold spores, bacteria, etc. Easy to use; chemical free Use the 32 oz. jar for very large indoor spaces