I have a Ridgid 4 gallon wet/dry vac that I'm using for my pellet stove. There of course is no bag filters for this model but I was wondering if anyone had make shifted a drywall bag to work in a vac of this sort. Hepa filter for this seems to be failing me as I have found a small amount of soot that escapes through the exhaust of the canister even with a clean filter. Any suggestions would be great...Thanks