Pentek -20BB Carbon Block Filter Cartridge, 20" x 4-5/8", 10 Microns

for chlorine, taste & odor reduction, as well as sediment filtration 20" Big Blue Housings and other 20" heavy duty housings and can replace any 20" x 4.5" carbon water filter cartridge helps plugging, maximizing utilization while maintaining low pressure drop tested and certified for your peace of mind 30,000 . Replace every 6 months or when you notice a drop in water pressure or water quality