Reach for the Pentair OMNIFilter CB1 Carbon Block Taste & Odor Filter when it s time to change the filter in your undersink water filtration system. This filter is highly effective at reducing unwanted bad taste & odor chlorine taste & odor and other contaminants. The wide range of contaminants it can reduce makes this filter an ideal choice for a variety of applications. It also makes an excellent polishing filter or pre-filter in fine filtration and high capacity applications.