High Pressure Hydro Jetting, also known as Water-Blasting and sometimes Water-Cutting, is the use of a Hydro Jet that forces highly compressed and pressurized water out of a small hole or nozzle, which causes restriction and produces a high-pressure water stream. This water stream is so powerful it will cut through grease, ice and even concrete, hence it is an effective and precise tool used in many industries.
When correctly applied, high pressure Hydro Jetting can provide acceptable levels of cleaning without damaging anti-fouling coatings or releasing toxins to the environment, but this requires fairly accurate control of jet angle and distance from the surface, and duration of impingement. In other circumstances water jetting can be used to remove paint. Water jetting can be applied manually by divers, by diver-operated carts, or by ROVs. Pressures of between 350 and 1400 bar may be used in high-pressure water jetting.