The Carbon Block Filter Cartridge is extruded or sintered by quality activated carbon or NSF certified high density activated carbon and harmless adhesive as main materials. Its ash content is controlled to be the lowest to retain more effective micro-pores. The large surface area has a tremendous capacity to absorb Chlorine, unpleasant ordor, color, spore. The coconut shell activated carbon filter cartridge has a better effect to the chemicals such as Trihalomethanes(THM’S).