Monitored Dual Filtration System Replacement Filter Cartridge Set, Chlorine, Bad Taste, Odor & Sediment Reduction, Granular Activated Carbon, High Surface Area For Maximum Absorption, Reduces MTBE, Pesticides, Herbicides & Chemicals, VOCS, In Combination With D-40, Taste & Odor/Chlorine/Desiment/Giardia & Cryptosporidium/Lead/VOCS/Asbestos, 99% Reduction Of Dissolved Lead, 91% Reduction Of Mercury, 99.95% Removal Of Disease Causing Giardia & Cryptosporidium Cysts, Asbestos, Chlorine, .5 Micron, Nominal, Filtration, CBC Activated Carbon Block With Lead Reduction Media, For Use With Model # SY-2300 & Model #SY-2650.