Pentek CFB-Plus 20 Cartridge are an enhanced version of our CFB product. It offers the same benefits with even greater chlorine taste and odor reduction and the highest sediment reduction found in a carbon Cartridge. * CFB-Plus Series products are modified molded blocks manufactured using Pentek's proprietary Fibredyne technology. This technology creates a unique Filter media by attaching powdered activated carbon onto a cellulose-free synthetic fiber matrix. The result is a single Cartridge that combines the benefits of both a sediment Filter and a carbon block into a single Cartridge with two times the chlorine taste and odor reduction and dirt-holding capacity of traditional blocks. * In addition, this technology will not release fines into the effluent stream due to a unique post-filtration layer that is fused to the carbon/fiber media blend.