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I think they are different things. One is a technique of doing something, whereas the other is a more technical description of a the mechanisms of a pressure washer. Leave them as they are is my vote. Mincan 19:18, 21 March 2007 (UTC)

I suppose it is also an equipment in Pulp mills. It keeps dirty pulp in overpressure. This allows appr. 100 degrees celsius pulp to be washed without boiling. Could somebody add this in the article?

“High-pressure water at medium pressure, in combination with special chemicals, aids in the removal of graffiti.” What. (talk) 22:55, 10 July 2012 (UTC)

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