In the case of damage-free sewers, the pressure at the nozzle should not exceed 120 bar. The corresponding pump pressure is to be determined and regulated considering the individual limiting conditions.

When sewers are damaged, a much lower pressure has to be used at the nozzle. The load caused by the high-pressure water jets can be decreased by increasing the distance between the nozzle and the pipe wall, e.g. by using a guidance device (skids or a sleigh). In individual cases, high-pressure cleaning can be prohibited due to structural reasons.