I've had an Oneida Mini-gorilla for a bit over a year; it's working well. Its HEPA filter is getting clogged, CFM is down, and the manual makes it clear I should be blowing compressed air, between 30-60 psi, downward at the filter (approx 20 degree angle from a distance of 6 inches) to blow dust off the filter media.
With a shopvac hooked up to the bottom of the filter, the shopvac will remove the dust I blast free, and that's how CFM is maintained throughout the useful life of the filter.
So I guess I need an air compressor. I've never owned one, hoping for recommendations. The filter is a decent size -- it'll be over 800 square inches of surface area to blast with compressed air -- so I'm wondering if I get a small, quiet compressor with a low SCFM and small tank (like this one) -- will it take 16 hours? Do I need an 80 gallon, 5 hp monster? Are there other tools which produce enough compressed air?