Why Waterjet is the Best Method for Cutting Flat Materials The original use of the waterjet, which was invented in the 1950s, was to cut lumber from large trees. Because of advancements and improvements through the year, the waterjet method has been used in many applications in cutting flat materials including stainless steel and aluminum. In order to cut or clean materials, a waterjet uses a high pressure stream of water. Waterjet method cuts through materials which water released from a nozzle at high speeds; this cutter is connected to a high pressure water pump that is the source of the water. Putting additives in the form of abrasives helps in the cutting process. With waterjet cutting, the working environment of the machine operator is greatly improved and thus reduces problems of exposure.