– Katytis takes us through his method for best results with this design classic, the Chemex! Using only paper and glass, the Chemex is a very simple way of brewing coffee. A slightly thicker paper means more fines are filtered out in the brew giving a really clean, crisp mouthfeel. The flip side of this is that it can slow down the flow rate. To compensate for this, we recommend grinding slightly coarser than usual and dosing up slightly.