There is anther system. its a plasic liner also that does not require digging. Its put in the existing and swells up to the pipes inside. One of the guys in the office just said, that the stuff is a plasic and is injected in to the clay pipe and expands and breaks the pipe and takes the place of the pipe. call you local guy and ask him if he knows about the 2 systems. Good Luck.... You need the guarantee, for this type of a job.