CB series carbon block filters are manufactured with high purity coconut shell activated carbon with high chlorine reduction and great dirt-holding capacity.  These filters are ideal for point-of-use (POU) and reverse osmosis applications. for residential, food service, commercial, and industrial applications. 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.