Legionella in residential home for the elderly
Munich

The problem
Due to extremely high legionella values the health authority shut down the sanitary equipment in a nursing home, which was built in the 1970s in three phases of construction with a total of almost 300 apartments. After repeated decontaminations by means of heat the legionella contamination increased again very quickly. The costs: several ten thousands of euros.

The solution
At first Merus was only installed at the inlets to the building and behind the hot water tank.

The check ing
Shortly after the installation was completed the CFU - values dropped by about 80%. After three more months the numbers dropped further everywhere with the exemption of a little used sector, in which compared to the first measuring slightly increased numbers were detected. Merus retrofitted a ring there. About one year later the water in this sector also conformed to the compulsory limit value of 1000 CFU/l, whereas the other sectors had reached this value after only six months. Today, this building is considered to be free of legionella and no longer is on the watch list of the health authority.