Abstract: A gas block (10) for the removal of multiple contaminants from a gaseous stream from an electrolyser (1). The gas block (10) comprises at least one inlet (13), the at least one inlet being configured to receive a gaseous stream from an electrolyser, and at least two outlets (12, 14), wherein the first outlet (12) is configured for the removal of contaminant liquid from the gas block, and the second outlet (14) is configured for the release of the gaseous stream from the gas block. A first removal chamber (15) is situated along a flow path of the gaseous stream between the at least one inlet and the first outlet, the first removal chamber being for removal of liquid and/or vapour from the gaseous stream. A second removal chamber (16) is situated along a flow path of the gaseous stream between the first removal chamber and the second outlet, the second removal chamber being for removal of a further contaminant from the gaseous stream.

Abstract: According to one embodiment of the present invention there is provided a combiner for the removal of hydrogen/oxygen gas in a gaseous stream, said combiner comprising: a pipe capable of accommodating the flow of a gaseous stream, wherein the pipe is adapted to transmit the gaseous stream to a catalytically active structure (CAS), the CAS having: contact with the substantial majority of the gaseous stream, a housing, and an inlet, said inlet being connected to the pipe, and an outlet, for the removal of the gaseous stream post recombination, and a second pipe connected to the outlet of the CAS for the transmission of the gaseous stream away from the combiner. A second embodiment of the invention sees the CAS housed within an electrochemical cell directly.