Guide to Waterjet Cutting and Its Benefits 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. High pressure stream of water is used for the waterjet method in order to cut or clean materials. 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. To help cut the materials abrasives are added to the water. With waterjet cutting, the working environment of the machine operator is greatly improved and thus reduces problems of exposure.