I purchased my first reusable coffee filter, in an attempt to produce less waste and all that. But the filter I purchased lets through the finest bits of the coffee beans and then there's this swirl of "coffee grit" in the bottom of my cup. I've tried not grinding the beans so fine, but still I get this "grit". Do all reusable filters do this or is it just this grocery store model that I purchased? This morning I went back to my trusty unbleached paper filter and had a much happier cuppa.