FIELD: automatization of electrolysis of aluminium. SUBSTANCE: time interval, for instance 0-40 h, is set with the use of automatic process control system under mode of automatic control over electrolyzer. Number N of changes of sign of movement of anode and presence of anode effects with voltage $$$ exceeding 14.0 V are registered during this time interval. If number N exceeds specified value and if $$$ 14.0 V fouling of MPR is registered. EFFECT: enhanced timeliness of control, reduced losses of electric energy and starting material. 1 tbl
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