Chemex is a pour-over method, which means that the water passes through a bed of coffee and a filter, normally made out of paper. In contrast to say a French press, the Chemex will give you a remarkably clean cup of coffee.
Insert the filter in such that it sits properly in the Chemex. We are using a cloth filter here although a paper filter would also be appropriate.
Add grounded coffee to the Chemex and shake the vessel to make a flat bed of coffee grounds.
Slowly add roughly 25% water in a swirling motion and wait for a couple of seconds for the coffee to release its carbon dioxide in the form of bubbles.
Slowly in a swirling motion add the remaining water to the Chemex.
Wait for the coffee to brew and let the water drain completely into the vessel.
Pour it into a cup and enjoy your hot brew!