An apparatus for automated decantation of a multi-phase fluid mixture comprising a decantation container, a floating marker, a sensor, a plurality of engines and a plurality of micro-switches. The decantation container comprises an inlet valve and at-least two outlet valves. The floating marker is housed within the decantation container. The floating marker is of a selective density. The sensor is attached at a bottom surface of the decantation container. The plurality of engines are connected with the sensor. The plurality of engines controls an opening and a closing of the at-least two outlet valves. The plurality of micro-switches are connected to the plurality of engines. The plurality of micro-switches control an amount of power supplied to the plurality of engines.