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How can I avoid legionella development in drinking water?

At water temperatures between 25 and 55 degrees, legionella and bacteria can multiply and occur in increased concentrations. These die off again at water temperatures above 70 degrees. For this reason, the temperature of warm water in the pipe system shall be at least 55 degrees, and that of cold water shall not exceed 25 degrees. Along with the temperature, stagnating water also favours bacteria proliferation; therefore, permanent flow of water through the drinking water installation shall be ensured. Avoid dead pipes and water stagnation. Regular water exchange at tapping points shall be executed every 72 hours at the latest. Regular water exchange after 7 days at the latest is part of proper and intended operation of a drinking water installation.