Remove the water reservoir from the Keurig machine
Wash the reservoir and rinse it thoroughly
Remove the filter holder from the reservoir
Soak the charcoal filter in fresh water for 5 minutes
Rinse the filter under running water for 60 seconds
Insert the filter into the filter holder
Snap the filter holder closed
Place the filter holder back into the reservoir
Fill the reservoir with fresh water
Reattach the reservoir to the Keurig machine
Run a few water-only brew cycles to flush the filter