Nelsen Carbon Block Cartridge. The surface modified carbon block filter technology that is highly effective reducing bad taste, odor, and the reduction of chlorine and chloramines from potable drinking water. The filters are made using high performance coconut shell carbon, which has more micro-pores compared to other types of carbon. Coupled with a unique binder system, these carbon block filters deliver a product with superior adsorption capacity and kinetic dynamics. The unique high capacity filters provide cost effective water filtration solutions in a size and configuration that offer ease-of-use, extended service life and high capacity, with a low pressure loss.