The invention relates to a method for producing a medical Solution from at least one first and at least one second liquid component, wherein the first component and the second component are conveyed by a respective conveying means in order to obtain a mixed Solution. The conveying means are operated in such a way that a modulation of the concentration of the first and the second component occurs and that the conductivity, or a parameter correlated with the conductivity, of the mixed Solution is measured at a measurement point. The modulation of the concentrations in a desired State occurs in such a way that no modulation or a specific modulation of the measured conductivity, or of the parameter correlated with the conductivity, occurs. The invention further relates to a device for producing a medical Solution and to a blood treatment appliance having such a device.
