Carbon Briquette Multimedia Cartridges High effective chlorine reduction through more than 3000 gallons LEAD reduction through 2000 gallons 99.95% reduction of Cryptosporidium and Giardia cysts Nominal 0.5-micron rating  Model: CBR2 Series    In addition to lead reduction, the unique formation of the carbon block enables it to reduce Cryptosporidium and Giardia cysts and fine sediment particles down to 0.5 microns.  As with the standard CBC Series carbon block, both the CBR2-10 and CBR2-10R are more effective at reducing levels of chlorine, and certain volatile organic compounds (VOCs), than granular activated carbon (GAC) cartridges.  The polypropylene outer wrap helps reduce coarse sediment particles, effectively extending the useful life of the cartridge.