Abstract: The present invention relates to a purification device for the purification of a liquid such as water, preferably drinking water, which purification device comprises at least one casing (1) having at least one insert (10), said casing (1) having at least one inlet (8) and at least one outlet (9) for the liquid and said insert (10) comprising at least one filter (15) located in a flow path of the liquid. The purification device comprises at least one galvanic couple (12, 14) located in said flow path. The present invention also relates to an insert and a method of purifying a liquid.