There is a solution to this problem that has been used successfully for years. But it is expensive a pipe is placed around the existing pipe line, it is then pressurerized and held at a set pressure the exterior line is then covered with a synthetic that repels growth of foreign bodies that might harm the pipe line while they are installing this boot they clean and repair the existing line. I am 72 and have many health problems but I have a sharp mind. And if you like what I say contact me.