Sewer cleaning has always been difficult and unhealthy work. Paris had to contrive, for sewermen, specific flushing units for removing grit from its interceptors. These machines, which are over a hundred years old and only take power from the water flow, could not be replaced by more mechanised systems based upon different concepts. It appears from these setbacks that all the connections with the past should not be severed; on the contrary, one should initiate a process relying upon a thorough review of the existing equipment and a new approach to in-water grit flushing. The resulting data then served as a basis for devising the concept of a new flushing machine which, though not revolutionary, will meet the operators' expectations.

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