The formulation of the filter permits the proper infusion time by regulating the filtration rate – not too slow, not too fast. Good infusion of the coffee grounds gives coffee a richer flavor while at the same time making possible precise fractional extraction filtering out the undesirable components which make coffee bitter and allowing only the desirable flavor elements of the coffee bean to pass through. Chemex filters remove even the finest sediment particles as well as the undesirable oils and fats. They are guaranteed not to burst under the weight of the liquid during filtration, and not to break when lifting out the grounds. The filters are designed for the 6, 8 or 10 cup Chemex coffeemakers.