Harmsco ® SureSafe ™Cartridges utilize Silver Zeolite technology. Since ancient times, silver has been used to purify water and kill bacteria. Combining inert organic materials with silver into our filter media, enables our cartridges to help eliminate odor-causing bacteria and inhibit growth of destructive mold and mildew. Harmsco ® SureSafe ™Antimicrobial media is interwoven with the latest in Silver Zeolite technology. Unlike competitive “treated media” products, Harmsco SureSafe ™ cartridges will continue to provide safety and protection for your customers while outlasting the competition. Harmsco ® SureSafe ™ Silver Zeolite technology has been effective against more than 650 strains of bacteria, fungi and molds in a laboratory environments. It has completed FDA testing and is registered with the EPA.