A high pressure water cleaning method and apparatus using a nozzle assembly wherein abrasive particles (172) are separated from a transport gas and injected into a high pressure water spray within an impact and mixing chamber (320) at an incidence angle (MA, MA') and velocity sufficient for the separated...http://www.google.com/patents/US5551909?utm_source=gb-gplus-sharePatent US5551909 - Method and apparatus for cleaning with high pressure liquid at low flow rates
