Star Brite NosGUARD SG Mold and Mildew Slow Release Formula is the most effective way to eliminate and prevent mold and mildew odor and other foul smells from forming year round. Controlled release allows it to remain effective for up to 3 months, keeping enclosed areas odor-free, crisp and clean smelling. Star Brite?s EPA certified chlorine dioxide technology is safe for use around people and pets. Each patented CLO2 generator pouch treats an area up to 1,000 cu. ft. safely and effectively. Also great for treating cars, RV?s and boats. Also try Star Brite?s NosGUARD SG Mold and Mildew Fast Release Odor Control System for immediate removal of foul odors caused by mold, mildew, pets, food, smoke and more.