The GE FXULC activated carbon block water filter produces healthier and better-tasting drinking water and cooking water. It reduces lead, mercury, atrazine, lindane, cysts, asbestos, turbidity and chlorine taste & odor. The GE FXULC under sink water filter also reduces sediment and rust particles. The GE FXULC single stage under sink drinking water filter replacement filter is compatible with the following systems: GX1S15 GX1S01C GN1S15C GN1S20C GX1S04C Culligan US-550 D30 D40 The FXULC reduces the following from your water 89% of Atrazine 90% of Mercury 98% of Lead 92% of Lindane 99.99% of Cysts 97% of Chlorine taste and odor 99% of Asbestos 99% of Turbidity Class I Particulates Rust The GE FXULC single stage water filter should be replaced every 6 months or 600 gallons.