The GE SmartWater replacement faucet filter cartridge (FXMLC) fits the GE GXFM03C Faucet Filter. It improves the taste and odor of the water and removes the following impurities: 99.99% of Cysts, 98.9% of Turbidity, 99% of Lead, 97.5% of Chlorine (Class I), 94.9% of Atrazine (a herbicide), 97.6% of Lindane (a pesticide), and Particulates 0.5-1.0 Micron (Class I). GE recommends that you replace the filter every 3 months OR after 200 gallons of water have been filtered OR if you notice a decrease in the flow of water or objectionable tastes in the water.