A system for treating a textile material with ozone gas, the system comprising - a hollow chamber comprising in its interior a plurality of guide rollers, the plurality of guide rollers being configured to contact and guide the textile material to pass, being lengthwise tensed and breadthwise spread out, through the hollow chamber; - an ozone supply system that is an ozone generating device connected to the hollow chamber and configured to supply to the latter ozone gas at a desired concentration value; - a textile-feeding port that is adjacent and connected to the hollow chamber, and comprises a first tank that is configured to contain a first pool of a first liquid preventing the leak of ozone through the textile-feeding port when the system is operated; - a textile-discharging port that is adjacent and connected to the main chamber, and comprises a second tank that is configured to contain a second pool of a second liquid preventing the leak of ozone through the textile-discharging port when the system is operated; - a plurality of driving rollers configured to drive the textile material to move through the system; wherein the system is configured so that the textile material successively passes through the first pool, through the interior of the hollow chamber, and through the second pool, the system being characterized in that it comprises an ozone concentration monitoring sensor arranged in the hollow chamber and connected with a microprocessor system, the microprocessor system being connected with a control system of the ozone generating device for adjusting an ozone generating speed of said ozone generating device according to the desired ozone concentration value, said desired ozone concentration value being of between 2 g/Nm 3 and 150 g/Nm 3, and the hollow chamber comprises in its interior at least one tension compensator configured to control the tension of the textile material when the latter passes through the hollow chamber. - a hollow chamber comprising in its interior a plurality of guide rollers, the plurality of guide rollers being configured to contact and guide the textile material to pass, being lengthwise tensed and breadthwise spread out, through the hollow chamber; - an ozone supply system that is an ozone generating device connected to the hollow chamber and configured to supply to the latter ozone gas at a desired concentration value; - a textile-feeding port that is adjacent and connected to the hollow chamber, and comprises a first tank that is configured to contain a first pool of a first liquid preventing the leak of ozone through the textile-feeding port when the system is operated; - a textile-discharging port that is adjacent and connected to the main chamber, and comprises a second tank that is configured to contain a second pool of a second liquid preventing the leak of ozone through the textile-discharging port when the system is operated; - a plurality of driving rollers configured to drive the textile material to move through the system; wherein the system is configured so that the textile material successively passes through the first pool, through the interior of the hollow chamber, and through the second pool,