Large jet angles result in high cleaning performance and a low drive force, whereas small jet angles result in low cleaning performance and a high drive force.

To clean heavily polluted pipelines, cleaning nozzles with a larger jet angle (preferably 30°) are to be used. This jet angle ensures a good removal of the solid deposits and incrustations while providing sufficient energy to propel the cleaning nozzle through the sewer.

If the transport of removed deposits is the main objective, in particular with regard to long sections with high deposit quantities, smaller jet angles (< 20°) should be chosen, if possible [Bosse2004].

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