Augering the sewer main line is Roto-Rooter's stock in trade, a service they have been providing since the 1930s. The process begins by wheeling their large root-cutting machine into your house and as close as possible to your sewer trap. Electric access is needed. The technician opens up the sewer trap and advances the auger down the sewer line. At the end is a rotating cutting head that cuts into shreds the soft obstructions, sending them down the sewer line and to the city main line. The Roto-Rooter machine is even strong enough to cut through tree roots. But should the tree root prove to be too strong, it might break the auger head.