The building stock in Charlottenburg-Wilmersdorf shapes the pipe problems. Between Savignyplatz, Kantstraße and Wilmersdorfer Straße, Gründerzeit period buildings from the 1890s to 1920s stand side by side with cast-iron riser pipes. In Grunewald and Schmargendorf, villas with long stoneware main lines dominate. Charlottenburg-Nord is characterised by post-war buildings from the 1950s to 1970s with central supply lines. Each building type brings its own challenges for drain cleaning.
The drinking water in Charlottenburg-Wilmersdorf comes from the Beelitzhof waterworks (16.9 degrees German hardness) and Tiefwerder waterworks (22.0 degrees German hardness) according to Berliner Wasserbetriebe – significantly above the Berlin average of 14 to 18 degrees dH. This hard water accelerates limescale deposits in pipes considerably. In the cast-iron pipes of the Gründerzeit buildings around Savignyplatz or along Kantstraße, this leads over decades to diameter reduction: a DN 100 pipe can effectively narrow to DN 50 or less before complete blockage occurs.
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