A flow limiter for setting a maximum flow of water at an outlet from a mixing faucet, wherein the flow limiter is arranged inside a cylindrical shell, wherein the flow limiter in the axial direction comprises: - a seat (3a, 3b) which along its periphery is provided with an annular wall (8a, 8b) and has flow channels arranged inside and along said wall (8a, 8b), - a filter head (10a, 10b) upstream of the seat (3a, 3b) where the filter head surrounds the annular wall (8a, 8b) of the seat and exhibits a dome-shaped filter directed against the flow, - an actuator (30, 50) which is rotatably arranged on the seat (3a, 3b), - a regulating device (20a, 20b) which is arranged inside the filter head (10a, 10b), resting on the actuator (30, 50) and inside said annular wall (8a, 8b), in the form of a body provided with a through-hole and with a circumferential envelope surface (22, 43) facing the inside of said annular wall (8a, 8b), wherein the actuator (30, 50) comprises means (34a, 34b) for moving the regulating device (20a, 20b) in the axial direction, and wherein an annular cavity is formed between annular walls which are formed by the envelope surface (22, 43) of the regulating device and the annular wall (8a, 8b) of the seat, in which annular cavity an O-ring is arranged, wherein one of the envelope surfaces (22, 43) and annular walls (8a, 8b) of the annular cavity has open, axially extending grooves (9, 44) with a cross-section area increasing in the direction of flow, whereby the O-ring is arranged in its plane to slidably connect to said grooves (9, 44) and to be set into one of predetermined positions in the axial direction along said grooves (9, 44) when the actuator (30, 50) is rotated, and wherein said predetermined position corresponds to a set maximum flow determined by a cross-section area for channels, set thereby, which is limited by the O-ring and the walls of the grooves (9, 44) in the plane of the O-ring, whereby water can flow through the filter, through said channels and further out through the flow channels of the seat (3a, 3b), characterized in that - a constant-flow regulator is integrated with the flow limiter in that the flow limiter comprises means for automatic regulation of a set maximum flow independently of variations in the pressure of the water, wherein said means consists of the O-ring which expands at a higher pressure than a guiding value of the water flow, such that the O-ring penetrates deeper into the grooves (9, 44) and hence automatically reduces the set cross-section area of said channels and the opposite situation at a pressure lower than the guiding value of the water flow through the mixing faucet. - a seat (3a, 3b) which along its periphery is provided with an annular wall (8a, 8b) and has flow channels arranged inside and along said wall (8a, 8b), - a filter head (10a, 10b) upstream of the seat (3a, 3b) where the filter head surrounds the annular wall (8a, 8b) of the seat and exhibits a dome-shaped filter directed against the flow, - an actuator (30, 50) which is rotatably arranged on the seat (3a, 3b), - a regulating device (20a, 20b) which is arranged inside the filter head (10a, 10b), resting on the actuator (30, 50) and inside said annular wall (8a, 8b), in the form of a body provided with a through-hole and with a circumferential envelope surface (22, 43) facing the inside of said annular wall (8a, 8b), wherein the actuator (30, 50) comprises means (34a, 34b) for moving the regulating device (20a, 20b) in the axial direction, and wherein an annular cavity is formed between annular walls which are formed by the envelope surface (22, 43) of the regulating device and the annular wall (8a, 8b) of the seat, in which annular cavity an O-ring is arranged, wherein one of the envelope surfaces (22, 43) and annular walls (8a, 8b) of the annular cavity has open, axially extending grooves (9, 44) with a cross-section area increasing in the direction of flow, whereby the O-ring is arranged in its plane to slidably connect to said grooves (9, 44) and to be set into one of predetermined positions in the axial direction along said grooves (9, 44) when the actuator (30, 50) is rotated, and wherein said predetermined position corresponds to a set maximum flow determined by a cross-section area for channels, set thereby, which is limited by the O-ring and the walls of the grooves (9, 44) in the plane of the O-ring, whereby water can flow through the filter, through said channels and further out through the flow channels of the seat (3a, 3b), characterized in that - a constant-flow regulator is integrated with the flow limiter in that the flow limiter comprises means for automatic regulation of a set maximum flow independently of variations in the pressure of the water, wherein said means consists of the O-ring which expands at a higher pressure than a guiding value of the water flow, such that the O-ring penetrates deeper into the grooves (9, 44) and hence automatically reduces the set cross-section area of said channels and the opposite situation at a pressure lower than the guiding value of the water flow through the mixing faucet.