Under no circumstances should the cleaning nozzle pause in one location while in operation, because the development or increase of damages in sewers, especially at joints and protruding side branches has to be avoided.

Before the start of the cleaning measure, it has to be checked whether the nozzle apertures are clogged to avoid additional and uncontrolled reaction forces at the nozzle and increased stress imposed on the pipe walls.

If the chosen flow rate and pressure do not suffice to remove and transport the deposits, the cleaning process should only be improved by increasing the flow rate.