HF sandblaster

Sandblasters of this kind are a PITA. The media, the tank, and hose all must be dry. You must figure out a way to vibrate or agitate--or at least "hand shake" it at times to keep the media from compacting.

Water in the air line seems to not be helpful, either. Not sure why, as the vacuum should pull the media in anyhow. I've often thought that the sharp 90 the media must make, as opposed to a sweeping elbow, might make the difference.

I've heard/ read about guys applying "some" pressure to the media tank. Remember, the absolute maximum vacuum equates to roughly 15 psi, so if you put 15 psi in the media tank, you've doubled the "supply" pressure