Membrane technology has become the main process for softening and hardness removal. It has obviouse advantages over the traditional sedimentation process, such as precise retention accuracy, less land space and shortened operating time. HOWIE alkali-resistant tubular membrane ensures the excellent resistance to organic fouling with its unique coating layer process. In the softening treatment of feed streams with high organic content, it maintains a high permeate flux while ensuring the quality of the filtered water during the softening treatment with high organic fouling.