Compatible to Intelifil (IF-SM-KDF850203) 20"x2.5" 30,000 Gal (3 lb) KDF-85-GAC Carbon Iron & Hydrogen Sulfide Removal Filter by IPW IndustriesIPW Industries Watts Compatible KDF 85 GAC Iron & Hydrogen Sulfide Removal Filter 20"2. 5" specialty cartridge with 3 lb KDF 85 and coconut shell carbon for well water treatment 30,000 Gallon Capacity Iron & HS Removal 10 Micron Nominal Intelifil Compatible This dual media cartridge combines 3 pounds of dark granular KDF 85 with coconut shell activated carbon to address the toughest well water problems: iron staining, rotten egg odor from hydrogen