METHOD FOR TREATMENT OF HARD WATER

Invention relates to the branch of water treatment with the use of ultra-filtration and it can be used in the systems of recycling water supply. The method of treating the hard waters includes the water treatment under pressure through ultra-filtration membrane in the presence of inhibitor. Process is carried out at periodic release of operating pressure to zero with its subsequent increase to the value of operating pressure, moreover, the zero pressure is created at reduction of the membrane output to 6-13 %. Due to the change of the hydrodynamic mode of ultra-filtration the increase of the working output of the membrane, of the degree of restoration of initial output and of the increase of the degree of reduction of the water hardness, which is treated, is achieved.