The FXMLC cartridges, as well as the GXFM04FBL system itself, have been discontinued. You can replace the FXMLC with the Culligan FM-15R replacement filters.
GE FXMLC faucet filtration filter for GXFM03C and GXFM04FBL reduces lead, cysts, lindane, chlorine, atrazine, turbidity and particulates class I.
The GE FXMLC removes the following items
The GE FXMLC filter has a capacity of 200 gallons and should be replaced every 3 months.
Price is for 2 filters.