Lanz Undergrounds Solutions Descales cast iron and metal pipes using machines with special heads to remove the scale build-up. Scale build-up happens over the years and can significantly slow down the outgoing flow on sewer and drain lines. In some cases, the scale can even stop up the line altogether and cause a sewer backup. Here at Lanz, we Descale the pipe and use a hydro jetter to clean the line and remove the scale. At that point, we can discuss and offer rehabilitation solutions for the lines if needed.