How To: Watch as Fred, designer and coffee expertise, teaches you how him and his wife make coffee using a Chemex Coffeemaker. Chemex Coffeemakers are manual pour-over style glass coffeemakers. Chemex filters are thicker than most so it eliminates any additional unwanted fats or oils. This allows the coffee to be flavorful without the bitterness or sediment. The coffee is ground medium fine and drips slowly through the dense Chemex filter.