WISY AG Germany has its company headquarters in Hitzkirchen, a small town surrounded by meadows and forest within the boundaries of the Vogelsberg nature recreation area in Hesse, Germany. The company was founded in 1989 by Norbert Winkler (WISY – Winkler Systems), who laid the foundation for the emergence of rainwater harvesting by inventing and patenting the filter collector with the unique filt
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