Carbon Block Cartridge is a filter in which the carbon is pressed or moulded into a tight block-like structure. Carbon block filters are radial flow filters in which the water flows from outside to inside and uses the entire surface area of the carbon. It extremely effective for reducing chlorine taste and odor, VOCs, MTBE and cysts depending on the cartridge and carbon used to make the block. Carbon block cartridges also offer very fine sediment filtration as a result of the structure of the carbon block. Micron ratings of carbon block cartridges range from 0.5 micron to 10 micron.