Feature●Removes 12 substances (free residual chlorine, turbidity (bacteria, particulates, etc.), chloroformm, bromodichloromethane, dibromochloromethane, bromoform, tetrachloroethylene, trichloroethylene, total trihalomethane, cat, pesticides, 2-MIB (mold smell), soluble lead)●Estimated expiration date (about 4 months per piece, 3 sticks are approximately 1 year)●For N301, N303 modelsDescription Kleinsui Counteron Water Filter Cartridges (3 Pack) 12 Substances Removal