Abstract: A method for controlling and managing the water flow to a coffee machine provided with an ion exchange water softener device, characterised by: determining, on the basis of the hardness of the mains water and the type of resins, the maximum volume of water treatable by said resins before saturated, feeding mains water to the coffee machine through said water softener device while measuring said water flow, the value of which is compared with the maximum treatable water volume, and on noting that the water volume which has passed through said water softener corresponds to the memorized maximum treatable water volume, directly feeding the mains water to the coffee machine while by-passing said water softener device, and in the meantime, regenerating the resins with brine and washing said resins on termination of said regeneration, and finally, again feeding water to the machine via said water softener device.