Just to add too,
I've got 2 and they work awesome! I have one hooked to a shopvac, the other to my festool vac. If I am doing a lot of very fine sanding I hook the DD's together to catch almost 100% of the superfine dust.
Especially on the festool, these save me BIG bucks on bags ($7 each) and filters ($60)for the vac. I always use a bag in my vacs, keeps the filters cleaner and easier to clean out the vac, also better performance from the filter - better suction since it doesn't plug up as bad.
If you don't have a DD, you can't go wrong. Just need a 2-5 gallon bucket and lid, some 1/4" bolts (if I remember right) and some silicon and you are good to go! (put the blue locktite on the bolts so they don't vibrate lose).
I just used my DD on my shop vac to clean up rabbit hair from having to shave my rabbit, all went in the bucket and I didn't fill up my vac at all. (rabbit had a skin problem so took clippers to it so could put medicine on it, man, do they look ugly naked, almost as bad as i do
)
Thanks for the post Rennie, maybe I'll get another.
Brian