The Sand Mantis has been used for reducing residuals using a patented water-jet system that transfers the material to a mill for grinding into smaller particles that can be more easily removed from the waste tanks. It sprays highly-pressurized water from a tiny opening made of gems, including sapphires – specially selected material that can stand up to the water’s pressure over time. The complete robot is 8 feet long and weighs approximately 800 pounds. The Sand Mantis cross-shaped body can be collapsed into a straight line for insertion through the small openings in the top of a tank. Once inside, the robot unfolds and is guided by remote control.