Hydro jetting uses high-pressure water to clear away even the most stubborn blockage in a sewer line such as those caused by tree roots or by an accumulation of household grease, hair, or paper products (i.e. p
Backflow weir sewer system main duct - has hinged flap held in incoming or on-going line above water at normal level by floating counterweight German Patent DE3937685 Kind Code: A1 Abstract: The backflow weir for the outlet from a drain system etc. into an outfall, flowing at right angles ...