Chemex Standard Pre-Folded Square Filters (100 ct.)
Inert glass is only half the magic of Chemex brewing; laboratory-style paper filters are the other. If you're buying a Chemex for the first time, make sure to get yourself a box of these as well. And remember, the folded side of the filter goes on the pour side of the vessel!
One box sets you up for 100 good mornings.