Kanberra Gel (R) is an all-natural proprietary blend of pharmaceutical-grade Australian tea tree & other Essential oils. When used, Kanberra Gel (R) allows the natural antiseptic properties of the oils to become airborne through an evaporative release. At the micro-biotic level, the air itself absorbs the pharmaceutical grade oils. As the air circulates and lands on the source (mold, mildew, etc.), Kanberra Gel (R) begins neutralizing and eliminating problems and associated odors on contact. It does so naturally, without chemicals.