Chemex filters are circular but folded into fourths so they are cone shaped. Compatible with any size Chemex coffee brewer (except CM-1 pint size model). They can be used with most conical coffee makers of any brand. These are whitened with an oxygen rather than bleach. These filters are substantial, heavier than standard paper filters, in part because more paper is used.
Filters out fine sediment and oils so the final brew is clear and flavorful. The Chemex brewing system has been around since 1941.