conduit 40 a the distal end of which is adapted to be submerged in the liquid in container 100 and to return that liquid via conduit 40 b into container 100 according to one embodiment conduits 40 a and 40 b may pass via disposing plug 24 however other embodiments may be utilized the end of conduit 40 b that is distal from circulation means 40 may be in a distance from plug 24 that will ensure that it will remain out of the liquid in container 100 when container 100 is substantially in upright position the liquid that is returned via conduit 40 b may be sprayed into the headspace of container 100 for example by forming the distal end of conduit 40 b to provide liquid in the form of a spray circulation caused by the operation of circulation means 40 may improve i e expend the amount of co 2 gas dissolved in the container and speed up the dissolving of co 2 in the liquid the inventor of the invention described in this application has discovered that when system 400 is in pressure equilibrium with the pressure inside container 100 after certain amount of gas was dissolved the activation of circulation means 40 so that carbonated liquid is pumped.