Abstract: The invention relates to a fluid-pumping system comprising at least two interconnected containers (1,2) and extraction and pumping means (5) for transferring the fluid content, in the form of water or air, from one container to another in a uniform manner. In addition, each of the containers (1,2) is equipped with an elastic membrane (3,4) which divides same into chambers (1a, 1b) and (2a, 2b). The wine product is kept separate form the water or air in each of the chambers, such that as one chamber (1a or 2a) in a container is being filled with a fluid in the form of water o air, one of the chambers (2a or 1a) in the other container is being emptied until a point at which the process is reversed, said exchange taking place in a uniform, continuous manner without interruption in the manner of a closed circuit.