Cuisinart DCC-RWF is a replacement charcoal water filter for Cuisinart coffeemakers featuring their premium Charcoal Water Filtration System. It is recommended to change the water filter every 60 days, or more often if you have hard water. To replace the water filter, lift the water reservoir lid and remove the filter holder. Open the holder and discard the used water filter. Remove the new filter from the plastic bag and place it in the recessed area at the bottom of the water filter holder.