Admittedly I don't read German, but I read the translated version and ... it looks very much like a typical sewage treatment plant in the US? What's unique about it?
Not adding any chlorine is an interesting choice in any case, you can start out with perfectly pure water and still end up with contamination along the way to your tap. A tiny amount of chlorine prevents that, and it evaporates quickly after the water leaves the tap.
Not adding any chlorine is an interesting choice in any case, you can start out with perfectly pure water and still end up with contamination along the way to your tap. A tiny amount of chlorine prevents that, and it evaporates quickly after the water leaves the tap.