GE recommends changing your filter every six months or when you notice a decrease in water flow to the dispenser or icemaker.  To remove the filter cartridge, open the filter door and pull the bottom of the cartridge so it will swing outward. Gently pull to remove the cartridge from the holder. A small amount of water may drip out when doing this.  To install the new filter, center the cartridge with the cartridge holder – make sure the word “Front” faces outward. Next, push the cartridge in until it’s fully seated. Gently swing the filter inward unit it’s in position.