The invention relates to a converter and a conversion method for converting an input data packet stream of consecutive data packets each data packet including user data in the form of a predetermined number of consecutive data symbols, S0,0. A plurality of frame members extend axially between and connect the first endplate to the second endplate. In one embodiment, the electrode is spaced from the vessel. The layers of first and second membrane support material are etched by applying an etching agent through the cavity in at least one first region located in an extension of the cavity also in a second region surrounding the first region. Further embodiments include methods of lowering surface tension of a medium comprising contacting the medium with a composition of formula, , or a mixture thereof. The turbine is actuated by fluid moving through the pipeline and leaves usable fluid pressure downstream of the turbine.