Pentair Pentek CBR2 Series Cartridges are advanced multi-media cartridges designed to reduce chlorine taste & odor and other contaminants. CBR2 Series Cartridges are manufactured using a powdered activated carbon (PAC) with a specially designed adsorbent media. These cartridges are protected by a uniquely formulated polyolefin bilaminate prefilter, designed to significantly increase the useful life of the cartridge by trapping sediment that typically plugs carbon block cartridges. As with our standard Pentek CBC Series Carbon Block cartridges, both the CBR2-10 and CBR2-10R are effective at reducing levels of chlorine taste & odor and other contaminants. The CBR2-10R has a built-in flow restrictor (0.6 gpm) to allow for maximum contact time.