Sewer cleaning is based upon the principle of sewer flushing enabled by built-in flap gates. The required flush water volume is generated by forced impounding of the water against an invert step so that sedimentation in the upper retention area is prevented. Additional openings for installation or special manholes are not required. The special gate design generates a selfcleaning action during the flushing process and prevents tressing at the gates. Sediments in the gate area that may be caused by the flushing medium or impoundage time are also removed due to the formation of a downsurge wave. The integrated custom-tailored system control enables a controlled and the maximum available cleaning efficiency of the sewer section to be achieved.

The flush water volume and impoundage level required are determined for the specific sewer length and diameter and additional project-specific parameters and taken into account in the further planning process.