At unexpected high financial cost we brought in a DemoUnit tower for display of the Hy2U. Three Hy2U's could be used for -indeed- hand washing. There was water in the bags, they functioned very convincingly, to the amazement of our visitors. Higher up the tower we had the colorful bags on display, most of them made by Hanneke. It really helped to be able to display 'niceness', a quality not available elsewhere at the conference.
Our stand was kind of illegal. Conference hall staff commanded to remove it, then accepted it under limiting conditions, then forgot about it.
We could not have succeeded without our tower!