We are cleaning the 4” cast sewer from an overhead stack clean out about 45’ out to the septic tank using our precision drain cleaning equipment to clean all the corrosion and scale build up from the pipe, hydro jetting and doing a video inspection to be sure line is clean, now the line is clean and prepped properly we are installing a 45’ of (4”)sewer liner from the overhead stack out to the septic tank. The seamless liner will not allow tree roots or scale build up which cause sewer back ups!