Pentair Pentek EP-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", 5

GREATER CHLORINE TASTE and ODOR REDUCTION than competitive 10 carbon blocks | FITS ALL 20" Big Blue or other heavy duty housings and can replace any 20" x 4.5" carbon filter cartridge | HIGH POROSITY DESIGN helps the cartridge from plugging before its adsorption capacity is exhausted | NSF INTERNATIONAL tested and certified for your peace of mind | 44,000 GALLON CAPACITY. Replace every year or when you notice a drop in water pressure or water quality