A method of introducing an amount of liquid into a package by means of a filling device, which filling device - comprises a cylinder having a piston and a chamber for liquid, - comprises a filling lance connected to the chamber, which filling lance comprises a mouth piece at a distal end thereof for dispensing liquid from the chamber; - wherein the cylinder is fitted with - a controlled inlet valve, and - a controlled outlet valve between the chamber and the filling lance; > wherein the method comprises the steps of: (a) - introducing a measured amount of the liquid into the package using the filling device, (b) - closing the package after introducing the liquid into the package using the filling lance, (c) -after introducing the liquid into the package, and without the mouth piece extending into the liquid which is introduced into the package, liquid remaining in the mouth piece is at least partially sucked back into the filling lance; < wherein the steps (a) and (c) are performed as follows: - in a first step the piston is moved in a first direction for discharging liquid through the controlled outlet valve from the chamber, to the filling lance, wherein the inlet valve of the chamber is closed and the outlet valve is opened, and - in a second step after the first step the piston is moved in a second direction opposite to the first direction for supplying liquid to the chamber through the inlet valve, wherein in a first stage of the second step at least the outlet valve is opened for sucking back liquid from the filling lance, and in a second stage of this second step the outlet valve is closed and the inlet valve is opened; characterized in that the cylinder is a first cylinder and the filling device comprises a second cylinder (110"), which second cylinder (110") comprises a second piston (411") and a second chamber (410"), wherein the second chamber (410") is equipped with - a second controlled inlet valve (130"), and - a second controlled outlet valve (140") between the second chamber (410") and the filling lance; wherein the first piston and the second piston (411") are driven in opposite phase. - comprises a cylinder having a piston and a chamber for liquid, - comprises a filling lance connected to the chamber, which filling lance comprises a mouth piece at a distal end thereof for dispensing liquid from the chamber; - wherein the cylinder is fitted with - a controlled inlet valve, and - a controlled outlet valve between the chamber and the filling lance; > - a controlled inlet valve, and - a controlled outlet valve between the chamber and the filling lance; > wherein the method comprises the steps of: (a) - introducing a measured amount of the liquid into the package using the filling device, (b) - closing the package after introducing the liquid into the package using the filling lance, (c) -after introducing the liquid into the package, and without the mouth piece extending into the liquid which is introduced into the package, liquid remaining in the mouth piece is at least partially sucked back into the filling lance; < (a) - introducing a measured amount of the liquid into the package using the filling device, (b) - closing the package after introducing the liquid into the package using the filling lance, (c) -after introducing the liquid into the package, and without the mouth piece extending into the liquid which is introduced into the package, liquid remaining in the mouth piece is at least partially sucked back into the filling lance; < wherein the steps (a) and (c) are performed as follows: - in a first step the piston is moved in a first direction for discharging liquid through the controlled outlet valve from the chamber, to the filling lance, wherein the inlet valve of the chamber is closed and the outlet valve is opened, and - in a second step after the first step the piston is moved in a second direction opposite to the first direction for supplying liquid to the chamber through the inlet valve, wherein in a first stage of the second step at least the outlet valve is opened for sucking back liquid from the filling lance, and in a second stage of this second step the outlet valve is closed and the inlet valve is opened; - in a first step the piston is moved in a first direction for discharging liquid through the controlled outlet valve from the chamber, to the filling lance, wherein the inlet valve of the chamber is closed and the outlet valve is opened, and - in a second step after the first step the piston is moved in a second direction opposite to the first direction for supplying liquid to the chamber through the inlet valve, wherein in a first stage of the second step at least the outlet valve is opened for sucking back liquid from the filling lance, and in a second stage of this second step the outlet valve is closed and the inlet valve is opened; characterized in that the cylinder is a first cylinder and the filling device comprises a second cylinder (110"), which second cylinder (110") comprises a second piston (411") and a second chamber (410"), wherein the second chamber (410") is equipped with - a second controlled inlet valve (130"), and - a second controlled outlet valve (140") between the second chamber (410") and the filling lance; - a second controlled inlet valve (130"), and - a second controlled outlet valve (140") between the second chamber (410") and the filling lance; wherein the first piston and the second piston (411") are driven in opposite phase.