System for deoxygenating, eliminating bacteria and cooling or freezing food products that are washed and in pieces, including: - a degasser by vacuum pump under absolute pressure of less than 30 mbar and able to reach 10 mbar, and a reinjector, under atmospheric pressure or slightly above, arranged in sequence with the degasser; - the degasser including; - a transfer tube positioned horizontally with a semi-cylindrical base having an impervious inlet sluice gate equipped with a first device with cells enabling fixed amounts of the product to enter, and a non-return impervious outlet sluice gate equipped with a second device with cells, the inlet sluice gate being located at one end of the tube; - a vacuum pump connected to two domes of the tube; - a motorised rotational shaft mounted on the inside of the tube and supporting a worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the tube base enabling the products to advance; - the reinjector comprising: - another transfer tube with a semi-cylindrical base, the inlet of which is formed by the impervious outlet sluice gate of the degasser and having another outlet sluice gate; the impervious outlet sluice gate of the degasser being located at one end of the other transfer tube; the outer outlet sluice gate, through which the products can leave via gravity, being located at the other end of the tube, - a device for injecting saturated vapour close to the inlet of products leaving said degasser; - another motorised rotational shaft mounted on the inside of the other tube and supporting another worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the base of the other tube, which enables the products to advance; - a bath of impregnation liquid into which the products can drop from the degasser, the other transfer tube being inclined such that the other outlet sluice gate is located above the level of the liquid. - a degasser by vacuum pump under absolute pressure of less than 30 mbar and able to reach 10 mbar, and a reinjector, under atmospheric pressure or slightly above, arranged in sequence with the degasser; - the degasser including; - a transfer tube positioned horizontally with a semi-cylindrical base having an impervious inlet sluice gate equipped with a first device with cells enabling fixed amounts of the product to enter, and a non-return impervious outlet sluice gate equipped with a second device with cells, the inlet sluice gate being located at one end of the tube; - a vacuum pump connected to two domes of the tube; - a motorised rotational shaft mounted on the inside of the tube and supporting a worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the tube base enabling the products to advance; - a transfer tube positioned horizontally with a semi-cylindrical base having an impervious inlet sluice gate equipped with a first device with cells enabling fixed amounts of the product to enter, and a non-return impervious outlet sluice gate equipped with a second device with cells, the inlet sluice gate being located at one end of the tube; - a vacuum pump connected to two domes of the tube; - a motorised rotational shaft mounted on the inside of the tube and supporting a worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the tube base enabling the products to advance; - the reinjector comprising: - another transfer tube with a semi-cylindrical base, the inlet of which is formed by the impervious outlet sluice gate of the degasser and having another outlet sluice gate; the impervious outlet sluice gate of the degasser being located at one end of the other transfer tube; the outer outlet sluice gate, through which the products can leave via gravity, being located at the other end of the tube, - a device for injecting saturated vapour close to the inlet of products leaving said degasser; - another motorised rotational shaft mounted on the inside of the other tube and supporting another worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the base of the other tube, which enables the products to advance; - a bath of impregnation liquid into which the products can drop from the degasser, the other transfer tube being inclined such that the other outlet sluice gate is located above the level of the liquid. - another transfer tube with a semi-cylindrical base, the inlet of which is formed by the impervious outlet sluice gate of the degasser and having another outlet sluice gate; the impervious outlet sluice gate of the degasser being located at one end of the other transfer tube; the outer outlet sluice gate, through which the products can leave via gravity, being located at the other end of the tube, - a device for injecting saturated vapour close to the inlet of products leaving said degasser; - another motorised rotational shaft mounted on the inside of the other tube and supporting another worm screw, the lateral ends of which are adjusted so as to virtually obtain the inner surface of the base of the other tube, which enables the products to advance; - a bath of impregnation liquid into which the products can drop from the degasser, the other transfer tube being inclined such that the other outlet sluice gate is located above the level of the liquid.