RO Filter Best Carbon BlockPowered by GreenBlock Technology Matrikx Chloraguard filters feature amazingly high capacity for chlorine reduction since it is made from a proprietary catalytic carbon that can deliver up to 4 times the capacity for monochloramine reduction. With a high dirt holding & absorption capacities, Matrikx Chloraguard filters not only meets but exceeds NSF and WQA standards. 1 Micron Nominal Filtration Proprietary Catalytic Carbon Exceptionally Low Pressure