Doulton Sterasyl Cartridges Features: Fits Industry standard 10" and 20 inch housings. Filtration efficiency of >99.99 at 0.9 microns Filtration efficiency of >99.9 at 0.4 to 0.8 micron Highly efficient bacteriological filtration Tested with live Cryptosporidium to a removal of >99.999% Ideal for R O guard and post filtration Complimentary to UV systems     34.95 Sterasyl Cartridges The Doulton Sterasyl is a highly effecient ceramic micro filter which provides genuine sub micron filtration of drinking water. Sterasyl is manufactured with the highly consistent and controlled pore structure necessary to remove a wide range of water borne contaminants over the life of the cartridge.   In addition to fine particulate matter, bacteria, cysts and turbidity are removed to a high level of efficiency.  The incorporation of silver locked within the ceramic structure inhibits the growth of bacteria and gives each cartridge enhanced bacteriostatic and self sterilising properties.