Hydronix CB Series Carbon Block Filters are manufactured with high purity coconut shell activated carbon and are available in a wide range of micron ratings. Hydronix blocks provide an exceptional cost-to-performance value. With high chlorine reduction, great dirt-holding capacity, and greatly reduced carbon fines, you will soon make the CB Series your carbon block of choice. Hydronix CB Series carbon block filters are ideal for point of use (POU) and reverse osmosis applications. These cartridges can be used in a wide range of applications such as residential, food service, commercial and industrial. The CB Series carbon blocks are great for displacing traditional GAC (granular activated carbon) and PAC (powder activated carbon) filters in applications where high chlorine reduction is needed.