What is the difference between a pressure pot blaster and a siphon-fed blaster?

Pressure pot blasters work faster (up to four times faster) than siphon-fed blasters. Further, pressure pots allow for more control of the blast media and pressure. With a pressure pot, you can blast at pressures as low as 5 psi for shading effects, etc. up to the higher pressures needed for certain substrates.

-Wes Barton, IKONICS Imaging