Cheap supermarket filters tend to be very thin visually and to the touch. We have compared commercial basket filters and found that holding them up to light shows thinness, and amount of loose paper pulp fibers, both signs of a cheap-ass filter! Most well-known brand name filters use higher quality filter paper. In fact, some good filters available under different brands appear to be made by the same factory, I believe (Cafec and Hario). And in some cases the same brand is made by different factories (Hario sold in USA is made in Japan, Hario in Europe is not). The photo to the right demonstrates 2 different qualities of filter material ... it's pretty clear that the thin transparent filter paper will not adequately filter the coffee.