have root clog issue. city put camera down main cleanout in house. about 10 ft in, there was a good root growth. camera actually pushed most of root ball out to street. cannot detect any misalignment in pipe. used rental auger with 3-4" cutter and drain worked fine for 1yr. than backed up again. i have a heavy piece of poly tube that i feed down cleanout and can always get water to flow. footing is 4' below street level. 50' house to street. i can see down into cleanout and pipe than appears to run level out to street. i assume it angles down to 8'-10' feet at street? city guy said dig down and pack cement around pipe. ugh. big hole. use root killer chemical? or use rental auger once a year?