75% of buildings in Germany with a total of 31 million residential units are over 40 years old. The RISAN® process is used to renovate outdated drinking water pipes in buildings from the inside. The pipes are cleaned gently and in an environmentally friendly manner from the inside (sandblasting) without any structural measures and then resealed from the inside with a plastic specially certified for the drinking water sector. The sustainable RISAN® process restores the drinking water quality inside buildings and preserves valuable building fabric. Without CO2 and without waste!