Aries (AF-10-2012-BB) 10" x 4.5" (2 lb) KDF-55-GAC FilterAries Filter Works 10" x 4. 5" Big Blue Specialty Filter Aries AF 10 2012 BB KDF 55 & GAC Dual Media Filter Cartridge Combines 2 pounds of KDF 55 redox media with granular activated carbon for extended chlorine removal, heavy metal reduction, and bacteriostatic control in whole house and well water systems 10" x 4. 5" 2 lb KDF 55 35,000 Gallon Capacity Bacteriostatic WHY IT WORKS Dual media filtration that extends carbon life and controls