The Sand Processing is a room in the Agon Wastes. The room connects Save Station B to the Main Reactor. The room consists of a large Half Pipe that is partially filled with sand and two "Humility" Class Turrets suspended on the ceiling. This sand can be used as a ramp to reach the high door to the Save Station.
There is a section of the half pipe on the east end that is weaken with Brinstone, and can be destroyed with a Missile to reveal a hallway to the Reactor. In addition, there is a small control room that can be accessed by using the Boost Ball to reach a small tunnel. This room has a terminal that can be scanned to remove the sand from the main room to reveal a Missile Expansion.