sludge washer truck at work on the side of the highway to clean underground infrastructure, eliminate blockages in the sewer road

action asphalt blockage blockages blocked city clean cleans clog clogged deposits dirty disposal drain drainage elimination equipment erosion facilities flow gutter hole hydraulic industrial industry infrastructure machine pipe pipeline pipes plumbing preparation professional readjustment rehabilitation repair road safety sewage sewer solid steel street sumps tool transport treatment underground urban waste water wells worker