In this category are continuous ion exchange systems, mixed bed ion exchange systems, continuous decolorization systems and automatic deodorization systems. Both continuous ion exchange system and mixed bed ion exchange system use ion exchange resin packed in the ion exchange column to complete the separation and purification. Continuous decolorization system is achieved by adsorption of activated carbon packed in the column. The automatic deodorization system is used to remove impurities such as odor, colored substances and organic acids from the liquid through the deodorization resin filled in the separation column. Ion exchange systems in general are the application systems of ion exchange columns.