In Großbeeren near Berlin, MRA GmbH rehabilitated a total of 430 m of ND 1000 sewer pipe using pipe reduction method with GRUNDOBURST 1900G. With this method, the outside diameter of the new PE long pipe is mechanically reduced and pulled into the defective old pipe by the bursting rig. After being pulled in, the reduced PE pipe string 'close-fits' to the inside of the old pipe. The first section was 130 m long, and the second section of over 300 m was later successfully rehabilitated.