Aries (AF-20-2085) 20"x2.5" KDF-85 FilterThe Aries AF 20 2085 is a 20 inch by 2. 5 inch specialty cartridge that combines coconut shell granular activated carbon with KDF 85 media to tackle hydrogen sulfide and iron in well water and whole house applications. This dual media design uses redox filtration to remove contaminants while inhibiting bacterial growth inside the filter housing. SPECIFICATIONS Aries AF 20 2085 Filter Details Manufacturer Aries Filter Works Model Number AF 20 2085