Proven efficiency

Advanced monitoring during the pilot test verified that head loss is reduced with
75 % and that the technology is extremely reliable

Rapid installation

The Groner Membrane can be installed in short time, kilometers can be installed
in few weeks.

All kinds of tunnels

The Groner membrane reduces friction loss in all kind of tunnels. In TBM-drilled
and lined tunnels friction loss can be reduced with up to 50 %. The economical
benefits are normally largest in old lined tunnels.