A pressure pot sandblaster is slightly different from the other popular siphon sandblaster setup.  One of the key things to realize is the name of each of the sandblasters to determine what they mean.  Just by looking at the names of each type will explain the major differences between them, but this will explain it further.

A pressure pot is exactly what it says.  It is a pot or tank that is pressurized.  The tank used on a pressure pot sandblaster is an enclosed container that holds the abrasive media with a mixture of compressed air, supplied from the air compressor.  Sandblasting abrasive must be first poured into the tank and is then closed off with a sealed cap.  This is a more efficient sandblasting process because all of the air is working on one goal- to flow a pressurized mixture out of one container.

These pressurized sandblasters are usually more desirable because they use less air and have higher blasting pressures, making them abrade faster and deeper into the item.

Overall, a pressure pot sandblaster usually is more expensive and can require more supplies for operating the control of the abrasive flow.