- A revolutionary and patented Norwegian concept
- Mathematical and numerical models by Sintef and Flow Design Bureau
- Physical models at Sintef Hydraulic laboratory
- Laboratory and field deterioration tests at Norwegian Building. Research Institute and Steinfoss Hydropower plant
- Unique membrane strength tests at NTNU with a custom made jack enabling 30 kN/metre tension combined with inner pressure
- Full scale field installation at Haaen near Trondheim