For an optimal result stop using those coffee filter and start using these 4"x4" Stainless Steel 50µ Waxy Screens that are produced in Germany. What really separates these from the rest is the fact that they are woven steel, meaning you can re-use them and can be adapted to various sizes. The Waxy 50µ Filter Screens contains 3 screens in a pack. Designed for use with the Waxy Glass Extractor Tube, but will work for any sifting, filtering or extracting needs.