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In aluminium electrolysis cell there is a layer of 10-20 cm of liquid aluminium. On top of this there is a layer of a melted salt electrolyte with a number of carbon anode blocks partially submerged. The density difference of the two liquids is small and low frequency waves can occur in the interface. The waves cause variation in the current distribution between the individual anode carbon blocks. These variations are in this article analysed and visualised with MATLAB to show information of the temporal variations, frequencies and spatial modes of the waves.