I would like to know filters specificities, like: composition and pore size (paper and steel) and what is the difference between use both kind of filters. Thanks! – From Bastian J.

Most of the filtering is accomplished by the bed of coffee. Only a bit of grind at the bottom of the bed is filtered only by the filter. The pore size of paper is much finer.

We do not recommend metal filters. Google coffee + cholesterol and read how paper filters block two unhealthy chemicals which pass through metal filters.