In this invention, some measures are taken, such as serially connecting exchange columns, immersing resin in chlorhydric acid for eliminating poison and "swaying, beating and exhausting" for exhausting air bubbles completely. Additionally, routine reclaiming process is used for reclaiming resin sufficiently, for example, alcohol wash and broken resin removing are used, If necessary. The pure water obtained according to this invention features high quality, high output of qualified pure water per exchange period, simple reclaiming operation and high efficiency. Industrial grade of acid and alkali can be directly used. |