The industrial softened water standard is to prevent equipment from scaling and ensure the operation of the system and the ground. The water used for water scaling should be treated to stabilize the water quality. The hardness of the effluent water should be less than 0.03 mmol/L(meeting the national low-pressure Boiler water quality standard) and "Quality stabilization treatment" The hardness of the effluent should be less than 0.03 mmol/L(meeting the "National Water Quality Standard for Low-Pressure Boilers" GB1576-2001)