Aries - AF-10-2211 - 10" x 2.5" GAC with 1.0 lb. KDF-85 Cartridge FilterAries Filter Works Model AF 10 2211 10" x 2. 5" KDF 85 & GAC Specialty Cartridge Dual media filtration combining 1. 0 lb of KDF 85 with granular activated carbon for iron, hydrogen sulfide, and chlorine removal in standard 10 inch housings KDF 85 & GAC 10" x 2. 5" Iron & H2S WHY IT WORKS KDF 85 extends carbon life while targeting heavy metals and sulfur compounds KDF 85 Chemisorption High purity copper zinc alloy removes iron, manganese, and hydrogen