An antimicrobial technology from Engelhard Corp., of Iselin, N.J., was granted registration by the USEPA for use in water purification applications to the military, hikers, campers and victims of earthquakes, floods and other catastrophic events. The technology is a highly effective biocide and deodorizer being used in a widening range of consumer and industrial applications. It can be tailored to release chlorine dioxide, a potent germ killer, at precise rates and in controlled concentrations when the powder or tablet comes in contact with water or moisture in the air.