Sandblaster saga continued

[jast]

Continuing the discussion from Sandblasting media:

Sandblasting media

Because I’ve never seen one, how do the pressure feeders work in terms of returning media for re-use? Is it a fill it up and use it til it’s out and then stop to refill? or is there a valve of some sort to let it auto-fill when it’s not under pressure? Maybe some other option?

Still curious on this.

Also, what about this??
http://dallas.craigslist.org/sdf/tls/5152284478.html
Looks like it was a good unit when new…