A device for loss-free filling of continuously mixed media in containers may include a mixing tank, a filler valve, and a connecting line. The mixing tank serves to receive and mix at least two different media, of which at least one medium is a fluid, and has a closing device for closing an outlet from the mixing tank. The filler valve serves for filling the mixed media from the mixing tank in the containers. The connecting line is arranged between the outlet from the mixing tank and the filler valve. Here the closing device has a ventilation line that can be connected with the connecting line to ventilate the connecting line to the filler valve. Also a plant may include such a device and a transport device for transporting the containers to the filler valve of the device.