So after years of procastinating I final bought a dust deputy for my shop vac. I unpacked it and screwed the 5 gallon pail to the top of my shopvac (limited shop space). I even bought a new paper filter for the vac, I then hooked everything up and put it to use. It seemed to be working fine but when I checked the filter it was full of dust What the heck? So, like any guy as a last resort I got the directions out and looked at the photos. Well I had the cyclone hooked up BACKWORDS, LOL!!! Once I hooked it up correctly it works great.