there have been several threads on this topic recently, so I thought I should give it a try. I have a 2.5 hp Oneida super gorilla. For the past five years I have checked the pan below the filter once a year and seen only a smattering of wood dust. I hand smacked it a couple of times first , but there seemed so little to be bothered about. The suction still seemed fine. After reading the recent posts, I blew on the side of the filter with my compressor and wiggled the pleats with my fingers, kind of like strumming a guitar. Loosened the top and rotated the filter and did it again. then I undid the bottom pan. It fell out of my hands and made a mess because it was full of fine dust and weighed more than I was suspecting. Hmmm, how about that? the suction has noticeably improved.
-bernie