The Doulton Supercarb is a two stage cartridge combining the highly efficient filtration properties of ceramic with the enhanced water treatment properties of activated carbon. First Stage The first stage consists of Doulton Sterasyl ceramic which is manufactured to provide genuine sub micron filtration. The cartridge reduces fine particulate matter, bacteria, cysts and turbidity. The incorporation of silver locked within the ceramic structure gives enhanced bacteriostatic and self sterilizing properties. Second Stage An inner core of activated carbon block removes chlorine and organic compounds.