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Chemex filters are 20-30% heavier (more absorbent) to remove undesirable sediment particles and oils. Chemex filters were scientifically formulated to permit proper infusion time while filtering out sediment, oil, and fats. Infusion gives coffee a richer flavor and makes possible the fractional extraction of only the desirable parts of the coffee bean. 

NOTE: These filters do not suit the 3 cup Chemex.

Q | What is the difference between the circle and square filter?
A | The only difference is the shape, the paper is the same. Some people find that the squares are easier to remove due to the points that rise above the carafe when the filter is placed in it.