Pentair Pentek ChlorPlus20BB 20" Big Blue Whole House Carbon Block Chloramine Water Filter - 1 Micron

Enjoy cleaner water throughout your home with sediment, down to 1 micron in size, and chlorine taste & odor reduction Superior chloramine and chlorine reduction than granular carbon Unique design reduces carbon fines in filtered water typically found in other granulated canisters Compatible with most 20" Big Blue housings and can replace any 20" x 4.5" carbon filter 500,000 gallon capacity - replace every year or when you notice a drop in water pressure or water quality