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Sewer Maintenance Process
The WWTP staff members may use the following types of equipment when performing inspection and maintenance of its sanitary sewer system:

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Jetter/Vactor
The jetter uses a high pressure water system to clean the sewer main of debris, such as sand, grease, and other materials that settle in the sewer main. Using a high pressure water system, the jetter propels a hose, with a specially designed nozzle, into the sewer main. The hose is then pulled back slowly while the high pressure water system flushes the materials to a downstream manhole for removal by the vactor. The vactor uses a positive displacement to create a vacuum that can lift debris from manholes.

TV Inspection
Closed circuit television video (CCTV) inspection equipment and pipeline inspection/asset management software is used to inspect sanitary and storm sewers. The system uses a self-propelled transporter to carry the camera down the sewer main. While the camera is in operation, visual data is recorded for maintenance assessment needs.

Manhole Inspection
Manhole inspections are performed to quickly verify how the large diameter sewers are operating, and to visually inspect signs of infiltration from the cover, walls, joints, and pipe connections. Manhole inspections should be conducted on a routine basis.