The pleated-paper canister filter on my 2HP DC is just overwhelmed.
Better than the old bag. A bag is good for 1 hour.... I really need to
do something.
I figure that if I were to upgrade to a double canister 3-4 HP set-up,
all it would do would buy a little time between dumping.

So, I'm told that a cyclone is the way to go. What do we know about
those things?

r