Not to be confused with Calgon, a soap company.Calgon Carbon Corporation is a Pittsburgh, Pennsylvania based company that manufactures and markets products that remove contaminants and odors from liquids and gases, both for industrial, municipal, and consumer markets. Calgon Carbon's product lines typically use activated carbon in various forms, UV light technology, or ion exchange technology, and the company is the largest producer of granular activated carbon (GAC) in the world.