An ink recirculating system for an inkjet printer, comprising: a) a tank for said ink, comprising: - a body delimiting a cavity which has an upper and a lower portion, wherein: - the lower portion comprises a convergent-shaped side wall, which converges towards a bottom and closing wall of the tank, and has a decreasing cross-section; - an outlet duct for the outlet of the ink from the tank, provided inside the cavity of the tank; - wherein said outlet duct is coaxial to a longitudinal axis of the tank; and comprises an inlet opening for the inlet of the ink to be moved out of the tank, provided above and near said bottom and closing wall; - a first duct for the inlet in the tank of the ink to be mixed, comprising: - an end portion having an opening for the ink supply to the tank, - wherein said end portion of the duct is provided in the convergent-shaped part of the lower portion of the tank; - preferably, a ventilation duct; - preferably, at least one sensor adapted to detect the level of ink in the tank; b) a pump in fluid communication with said outlet and inlet ducts, to convey under pressure the ink present in the tank from said outlet duct to said inlet duct; characterized in that: - the end portion of the first ink inlet duct is substantially tangent to a portion of a circular sector of the convergent-shaped side wall, of the lower portion of the tank, such as to create a substantially swirling flow in the ink present in the tank and a mixing of the ink and / or the components thereof present in the tank. a) a tank for said ink, comprising: - a body delimiting a cavity which has an upper and a lower portion, wherein: - the lower portion comprises a convergent-shaped side wall, which converges towards a bottom and closing wall of the tank, and has a decreasing cross-section; - an outlet duct for the outlet of the ink from the tank, provided inside the cavity of the tank; - wherein said outlet duct is coaxial to a longitudinal axis of the tank; and comprises an inlet opening for the inlet of the ink to be moved out of the tank, provided above and near said bottom and closing wall; - a first duct for the inlet in the tank of the ink to be mixed, comprising: - an end portion having an opening for the ink supply to the tank, - wherein said end portion of the duct is provided in the convergent-shaped part of the lower portion of the tank; - preferably, a ventilation duct; - preferably, at least one sensor adapted to detect the level of ink in the tank; - a body delimiting a cavity which has an upper and a lower portion, wherein: - the lower portion comprises a convergent-shaped side wall, which converges towards a bottom and closing wall of the tank, and has a decreasing cross-section; - an outlet duct for the outlet of the ink from the tank, provided inside the cavity of the tank; - wherein said outlet duct is coaxial to a longitudinal axis of the tank; and comprises an inlet opening for the inlet of the ink to be moved out of the tank, provided above and near said bottom and closing wall; - a first duct for the inlet in the tank of the ink to be mixed, comprising: - an end portion having an opening for the ink supply to the tank, - wherein said end portion of the duct is provided in the convergent-shaped part of the lower portion of the tank; - preferably, a ventilation duct; - preferably, at least one sensor adapted to detect the level of ink in the tank; - an end portion having an opening for the ink supply to the tank, - wherein said end portion of the duct is provided in the convergent-shaped part of the lower portion of the tank; - preferably, a ventilation duct; - preferably, at least one sensor adapted to detect the level of ink in the tank; b) a pump in fluid communication with said outlet and inlet ducts, to convey under pressure the ink present in the tank from said outlet duct to said inlet duct; characterized in that: - the end portion of the first ink inlet duct is substantially tangent to a portion of a circular sector of the convergent-shaped side wall, of the lower portion of the tank, such as to create a substantially swirling flow in the ink present in the tank and a mixing of the ink and / or the components thereof present in the tank. - the end portion of the first ink inlet duct is substantially tangent to a portion of a circular sector of the convergent-shaped side wall, of the lower portion of the tank, such as to create a substantially swirling flow in the ink present in the tank and a mixing of the ink and / or the components thereof present in the tank.