NOVELTY - The electrolytic cell comprises a housing or frame having first and second housing shells that are joined and clamped together via respective edge zones, two electrodes such as a cathode and an anode, an electrical connection at each electrode, a semi permeable membrane disposed between the cathode and the anode, spacers arranged between the membrane and cathode and between the membrane and the anode for forming a membrane chambers between the electrodes, and pressure units arranged in openings of the back walls of the shells to adjust contact pressure between the cathode and anode.    USE - The electrolytic cell is useful for separating solutions of salt water into hydrogen and oxygen.    ADVANTAGE - The electrolytic cell efficiently, economically and safely operated with less power consumption and high performance and stability.    DETAILED DESCRIPTION - The electrolytic cell comprises a housing or frame having first and second housing shells that are joined and clamped together via respective edge zones, two electrodes such as a cathode and an anode, an electrical connection at each electrode, a semi permeable membrane disposed between the cathode and the anode, spacers arranged between the membrane and cathode and between the membrane and the anode for forming a membrane chambers between the electrodes, and pressure units arranged in openings of the back walls of the shells to adjust contact pressure between the cathode and anode. Each of the two chambers has an inlet and an outlet for an electrolyte. The housing shells have back walls to support electrodes. The back walls have openings. The pressure units are arranged on a rear side of one of the electrodes and below a profile of the spacer and arranged in series with a uniform distance of 1-2 cm between them. An average pressure unit is present in an area of 3-4 cm 2 of the electrode. The pressure units are configured as screws, grub screws and a hexagon socket. The housing shell has a recess (15) within the back wall around the electrode. The recess is surrounded with an enclosure, an enclosure unit or structures for mutual fixing of the housing shells. The openings are equipped with an internal thread, and are arranged in rows with an equal distance between them. The housing shells have through holes (55) for supply and removal of the electrolyte. The through holes act as the inlet for electrolyte or the outlet for the electrolyte. The electrodes are formed as planar plates having a thickness of 4 mm and formed as long stretched slabs having an aspect ratio of 3:1. A distance between the anode and cathode is 1-3 mm, and is adjustable to an accuracy of Plus/Minus 0.1 mm. The inlet and the outlet are formed as a passage in the respective electrode, and are spaced apart from each other.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a cell housing for a first electrode.    Recess (15)    Holes (24)    Rear wall of cavity of first housing shell (33)    Threaded hole (45)    Through holes. (55)