Abstract: An air-water current purifying device allows the size of the bubbles from the mixture to be reduced includes an inlet for the air-water mixture; a first filter occupying the cross-section of the device, with a plurality of holes; a first expansion chamber after the first filter; a second filter with the same characteristics and arrangement as the first filter and located after the first expansion chamber; a second expansion chamber after the second filter; a third filter after the second expansion chamber, with the same features and arrangement as the first and second filters; a third expansion chamber after the third filter; a pressure-regulating valve arranged at the outlet of the device; and a regulating flywheel that allows the valve to be closed and opened.