Ensure uniform extraction for pure coffee flavour with these bonded, pre-folded, square shaped, unbleached filters. The thicker specialty fibre filter design keeps bitter elements, oils, and grounds out of your cup. Chemex filters are 20-30% heavier than other filters and remove even the finest sediment particles. The design of the filter facilitates the proper infusion time by regulating the filtration rate - about a 4 minute brew. They produce coffee with clarity, complexity, and with a light body. One warning: As the filters are made of heavy paper, they require a full rinse with hot water before brewing to remove any paper taste.