Ok, now I'm going from high&mighty, self righteous purchaser of USA made tools to the lowest, cheapest purveyor of junk made far away.
I was at the HF store and saw this "Industrial Air Filter" for $13! Of course I knew it is a piece of crap, but for that price I figured I had nothing to loose by trying to make something functional out of it. This is what is inside the can;
A lot of air and this little ceramic(?) filter. This thing is not even sealed to the housing, its held in place with a grip washer on the thru bolt. Truly a P.O.S.
This what I came up with;
The ceramic filter is pressed into a silicone washer at the top and sealed to the thru bolt with a rubber stopper and the whole thing pressed into place with the springs. The tube was added so the intake is at the bottom of the can instead of the top.
Then I filled the can with cat litter (Zeolite)
Bingo! Industrial air filter
I use compressed all the time, for blowing dust off lams, spraying finish, sanding, etc.
Hopefully this will prove to be an inexpensive alternative to a true industrial air filter.