umm ok ..some people tear off alittle peice of a notecard and roll it about the size of the hold you leave in the end and pack it in there to make a filter..umm it doesnt matter what end you use that i know of lol...just squeeze roll off one end and then put the filter in the other or dont use a filter ..it doesnt matter, um i dont thnk you can use another paper as a filter, i mnea you might be able to im just not sure though