Abstract: The invention relates to an electrolytic reactor, in particular for separating phosphate from phosphate-containing liquids and/or recovering phosphate salts, comprising an inlet (16) for an electrolysis liquid and a flow channel (20) adjoining same, a magnesium metering unit (12) comprising two electrodes (22, 24) of different polarity being arranged in the flow channel (20), at least one of the two electrodes (22, 24) being a sacrificial electrode (20), wherein the magnesium metering unit (12) is designed as a free-level reactor and a mixing/sedimentation unit (14) being connected downstream of the magnesium metering unit (12) in the direction of flow, said mixing/sedimentation unit having a feed inlet (40) for the phosphate-containing liquids and an outlet (26) for the purified liquid for the obtained phosphate product.