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Water jetting is widely used in the ship repair & marine industries. 300bar is used to remove marine growth & salt deposits prior to grit blasting. Larger pumps can be specified to allow multiple jetting guns to be used simultaneously.
700-1000bar will remove loose coatings & corrosion, leaving sound coatings intact, ready for repainting if total coating removal is not required. It is often said that if 1000bar does not remove the coating then it is sound enough to paint over.
2750bar (UHP) will remove all coatings & corrosion back to white metal. Marine paint manufacturers have developed paints to apply to hydro-blasted surfaces & actively promote this method as it removes all chlorides & provides the best possible surface for recoating.