40 Coffee filters 101. Coffee simply tastes better, thanks to a better filter. Melitta coffee filters with aroma openings are made from Nordic paper pulp. The filters contain no recycled fibers. The punched edges are machine-pressed, meaning no glue or other binding agents are used. Melitta coffee filters are perforated with tiny, small holes that allow the coffee to brew at the perfect speed. All the flavors and aromatic substances make it into the cup, while the bitter compounds remain in the catchment container.