In the most basic terms, trenchless sewer lining is the process of creating a new pipe inside the existing host pipe. A resin-saturated felt tube made of polyester is inserted or pulled into a damaged pipe. Little to no digging is involved in this trenchless drain lining process, making for a more environmentally friendly method than traditional “dig and replace” sewer and drain pipe repair methods. Trenchless sewer and drain rehabilitation methods are generally more cost-effective than traditional exhume (dig) and replace methods. Many people in San Diego are now looking to trenchless pipe lining as an alternative to traditional sewer and drain repair.