Sterilizing Gel is a chlorine dioxide based, controlled sustained release material. It includes one bag of powder and a releasing bottle. Simply add the powder into water in the releasing bottle, several minutes later, the gel formed. Then, It begins to release chlorine dioxide gas to the environment. Sterilizing Gel can be used as a air purifier and a deodorizer for odor and biological control in confined space, such as cars, refrigerators, freezers, houses, offices, libraries, bathrooms, storage rooms and so on.