DetailsOMNIFILTER CB3 ® Series C Replacement Water Filter Cartridge. Formerly TC3. Fits OMNI Undersink filters CBF3 and OT32, among others. 0.5 micron carbon block. Sediment, Rust, Chlorine, Lead and Mercury (harmful minerals), Cryptosporidium, Giardia Cysts, Volatile Organic Chemicals. 6 per case, priced and sold individually. Order a full case and save even more. IMPORTANT: DOES NOT FIT OLDER STYLE ORIGINAL AND SERIES A HOUSINGS. IF YOU HAVE AN OLDER STYLE HOUSING WE RECOMMEND THE KX PB1.