The cross-check of the performance indicators can be done via mirror inspections or CCTV inspections of the sections, or via manhole inspections after cleaning.

Further cost-effective methods for quality control of the performed cleaning services are the assessment of the perceived sound from the deposits during the suction procedure and the visual inspection of the flushing water discharge. These are carried out as follows:

• Acoustically: When sucked in, mud, stones or solidified deposits produce a distinct sound as they hit the inner lining of the suction tube. Thus, conclusions can be drawn regarding the degree of pollution and the progress of the cleaning measures.

• Visually: The visual inspection of the condition and/or color of the flushing water running off allows conclusions regarding the achieved cleaning results.

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