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Essential Parts of a Filter Drip Coffee Maker When you turn on your filter drip coffee maker, the resistance heating element heats the aluminum tube until water boils. Then, it flows over the ground coffee beans, picking up their oil essence on its way down to the pot. Different filters can alter the taste of your brew. Select a filter that matches your brewing device and is specifically designed for extraction. Filter baskets A filter basket is a mesh-like container that holds coffee grounds while brewing.