Reinigungsmittel für Anlagen zur Trinkwasserversorgung umfassend 30–80 Gew.-% Soda (Na2Co3), 1–10 Gew.-% eines Komplexbildner und 30–60 Gew.-% eines Sauerstoff-Abspalters.Detergent for drinking water supply systems comprising 30-80% by weight of soda (Na 2 Co 3), 1-10% by weight of a complexing agent and 30-60% by weight of an oxygen releasing agent.