I've started using my DC to clean the quasi HEPA filters of my two shop vacs (used for small tools). A little dust may collect in the 70 gallon box below the cyclone but basically I am sending the fine dust off the shop vac filter outside. It is contained in so much air I do not see a buildup. It doesn't take long to do and the filter doesn't even need to be removed from the vac. Best way to clean these filters I've come up with.