Aries (AF-10-2085-BB) 10"x4.5" Big Blue KDF-85 FilterAries Filter Works Aries AF 10 2085 BB 10"x4. 5" Big Blue KDF 85 Filter High capacity specialty cartridge combining coconut shell GAC with KDF 85 media for iron and hydrogen sulfide reduction in whole house applications KDF 85 Media Iron Reduction HS Removal Bacteriostatic The Aries AF 10 2085 BB pairs ResinTech coconut shell granular activated carbon with KDF 85 redox media to tackle iron and hydrogen sulfide while extending filter life through