At 14:00 on 7th December 2007 an 11-member Chinese delegation from the Construction Committee of Hangzhou visited the City Drainage Company Köln. The head of this Chinese delegation is Mr. Zhu Hao －Vice-Researcher of Construction Committee of Hangzhou. This delegation was accepted by Mr. Jürgen Werker at the 2007 finished pumping station Werthweg in Köln - Worringen. An inspection was accomplished there. Afterwards a discussion over the German sewage system/purification system took place.