Guide to Waterjet Cutting and Its Benefits Waterjet cutting was used largely in the 1950s to cut lumber from large trees. Today, because of advancements and improvements made on waterjet cutting methods, it can now be used for cutting any flat materials including stainless steel and aluminum. In order to cut or clean materials, a waterjet uses a high pressure stream of water. This cutter is usually connected to a high-pressure water pump with the water being released from the nozzle, which then cuts through the material with high-speed 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.