Its high pressure water, like about many thousands PSI, and its a tiny looking nozzle. And there is a grit like stuff mixed in, I think its finer than sandblast grit.
The laser cutters are extremely concentrated light beam. Sort of like those little flashlights that our grandsons play with, but much much more powerful, and damn dangerous in the wrong hands.
The waterjet thing is in a big dirty tank, its hard to describe, I did look down inside it, but I couldnt see much. The nozzle is under the surface of the water, from what I could see. They were showing me the finished parts that they had made with the thing, very impressive, and very quick.
Next time Im over there, I will pay more attention to it.