When we determine that a customer has a “main line stoppage’, the first thing that comes to mind is do you have a main line clean out. What is that? It is a plug of 3-4” in diameter with a raised head. Usually found near a toilet, could be in an adjacent wall or in the ground outside, if you have a pool, usually located within 2 feet of the pool “p-trap”. Possibly, you have had one installed in the ground between the house and the street if tree roots are a constant problem. This allows us a chance to adequately clean your main line with the proper size blade. Without one, we may have to reduce the blade size down to a single blade which is definitely not adequate, but might be the only thing we can do in your circumstance. If you have reoccurring main line stoppage, consider having one installed.