English translation: coarse screen/particle filter
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Sorry for putting this here, but I can't add onto my answer due to technical fault. The proper link for my suggestion is: http://www.karcher.com/scripts/bta/document/BTA-59611320.pdf and includes a diagram (DE: p. 9; EN: p. 12)
10:15 Feb 15, 2006
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24 mins confidence: peer agreement (net): +1
Explanation: Just a shot if it doesn't have to be entirely scientific