#20 Big Blue GAC Carbon Filter Cartridge – 20” x 4.5”

The #20 Big Blue GAC Carbon Filter Cartridge is a granular activated carbon (GAC) filter designed for whole house water filtration. Built to fit any standard 20” x 4.5” Big Blue housing, this cartridge effectively reduces chlorine, unpleasant tastes, and odors, delivering cleaner, fresher water to every outlet in the building.

This filter uses impregnated coconut shell carbon, known for its strong adsorption capabilities and chlorine reduction performance. While not NSF 53 certified, it offers reliable general-purpose water improvement for residential, irrigation, or light commercial applications.