NosGuard SG Mold/Mildew Odor Control Fast Release System Removes and prevents mold/mildew odors. 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. Package contains one (1) 10 gram pouch with a plastic "clamshell" deployment system. Not to be used while people or pets are present, but treated area is safe for use after being aired out.