CARBON BLOCK CARTRIDGES FCCBL-S Series cartridges have a high porosity design that helps prevent the cartridge from plugging before its adsorption capability is exhausted, maximizing the utilization of the carbon while maintaining low pressure drop. FCCBL-S series Aquafilter carbon Block filter cartridge for VOC reduction is manufactured by extrusion, using mix blend GAC granular activated carbon media for improved reduction of chlorine taste and odor, and high absorptive capacity. The 5-micron carbon block and is ideal for use as a reverse osmosis pre-filter or post-filter.