Star brite's Tea Tree Oil Air Purifier Gel offers a natural solution to unpleasant odors on boats, RVs, or in homes and offices. By harnessing the power of genuine Australian tea tree oil, the gel helps maintain air quality without the use of perfumes or caustic chemicals. Deploy the tub anywhere musty, moldy odors are present to keep air clean and fresh for up to three months. Ideal for winterized boats and year-round use. 8 oz. Maintains air quality - no caustic chemicals used Keeps air clean and fresh for up to 3 months Ideal for winterized boats and year-round use | Tea Tree Oil Air Purifier Gel, 8 oz