Pentair Pentek CBC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Carbon Block Replacement Cartridge with Bonded Powdered Activated Carbon (PAC) Filter, 20″ x 4.5″, 0.5 Micron. PREMIUM HIGH-CAPACITY SMALL PARTICULATE REDUCTION of bad taste & odor, and chlorine taste & odor to provide great tasting drinking water – FITS ALL 20″ Big Blue or other heavy duty housings and can replace any 20″ x 4.5 carbon filter cartridge – EFFECTIVE AT FILTERING fine sediment chlorine taste and odor – NSF INTERNATIONAL tested and certified for your peace of mind – 150,000 GALLON CAPACITY. Replace every 1 year or when you notice a drop in water pressure or water quality. Within a reasonable period of time. Whether you are entitled to a return. If you are entitled to a return. Sale items are non.