Abstract: A coalescence separator comprises a tank with an inlet for an oil-water mixture. In the upper area of the tank, a drain is arranged for the oil collected in the tank. In the lower area of the tank, a drain is arranged for the water accumulating in the tank. The water drain is provided with an ascending pipe which ends below the oil drain. A changeable coalescence element is arranged on the bottom side of the tank and is associated with the ascending pipe through a guide body which prevents swirls in a chamber of the tank above the coalescence element. The coalescence element is easily exchanged by removal from either the upper end of the tank or from below by way of a screw mounting.