How To Flush the Supply Line
The supply line runs from the water source, usually under the kitchen sink, to the water inlet valve on the appliance. Another line runs from the inlet valve to the ice maker. Lets first flush the line from the water source.
Before disconnecting the water line, unplug the refrigerator to avoid an electrical shock hazard.
Start by turning off the water at the source. Disconnect the supply line from the inlet valve and place it into a bucket.
Turn on the water supply and flush out the supply line. After thoroughly flushing the line, turn off the water and replace the supply line onto the inlet valve.
Next disconnect the other line(s) from the inlet valve and allow the water to drain into the bucket. Follow the line up the back of the freezer and remove any fasteners holding the line in place. Next disconnect the line from the connector that leads into the freezer.
Place the tubing in your sink and squeeze a few drops of liquid dish soap into the tube. Hold one end of the tube under warm running water and allow the other end to drain into the sink. Allow the water to flow through the tube until no more soap bubbles appear. You may wish to repeat this step. Alternatively, you can inexpensively replace the tubing if it does not come clean. Be sure to use a "food grade" quality of tubing suitable for transporting potable water.
Reconnect the supply line to the valve and turn the water back on. Check for leaks before moving the freezer back into place.
It may take a couple batches of ice before any effect can be tasted.