Removes and prevents mold/mildew odors to maintain indoor air quality. Also removes & prevents any other foul, unpleasant odors. Uses patented system to generate a deep-penetrating chlorine dioxide vapor that thoroughly permeates 100% of treated area. Sold as a twin-pack of two 10 gram pouches with plastic "clamshell" deployment systems. Can be used year-round in occupied boats, RVs, homes, offices or more.