In 1997 Calgon Carbon Asia was formed as a marketing subsidiary in Singapore, serving much of Asia, India, Australia and New Zealand. Calgon Carbon Corporation's CEO resigned in February 1998, reportedly over differences with the board of directors over company direction, and Calgon Carbon hired the firm Morgan Stanley for advice on a possible company sale. Also in 1998, the company developed a process to inactivate pathogens such as Cryptosporidium in drinking water, using UV disinfection. At that point the company launched two new products: ISEP for perchlorate removal using a continuous ion exchange system, and Sentinel UV Disinfection System, a disinfectant for pathogens.