To keep your coffee at the desired strength, make sure to use the Chemex Glass Coffee Maker Cover
Be sure to use the Chemex Glass Coffee Maker Cover with your Chemex coffee brewer. It will prevent evaporation, which will alter the taste of your coffee. The glass top is 2-3/4″ in diameter, and is designed with a top knob that makes it easy to place and remove the lid from your coffee maker. It will fit all sizes of Chemex coffee makers. Hand washing is recommended. For further information about the coffee maker cover and all Chemex products, visit Chemex online.