Easy Change Replacement Cartridge, For Level 4 Premium Filtration, Reduces Atrazine, Bad Taste and Odor, Chlorine, Cysts, Lead, Lindane, Microbial Cysts, Nominal Particulate Class I, Sediment and Turbidity, For Use With Use With TV #'s: 783-504, 787-756, 802-274 & 802-373.