You would need an air compressor of some kind to periodically hit the outside of the filter to blow off fine dust inside. I only have a small one, but Wynn recommends no more than 50-60 psi so it works fine. The cyclone gets probably 99% of the spoil, so I only have to empty super fine dust out of the bucket under the filter a couple times a year. Pretty sure most of that is from the drum sander.