日韩久久无码免费毛片软件,中文字幕久久熟女蜜桃,久久久久精品毛片二级A片中文,亚洲国产A∨无码中文777

Concept: Softening water aims to reduce the hardness of water through physical or chemical means. The hardness of water is mainly composed of cations such as calcium and magnesium. In the process of softening water treatment, the composition and structure of sulfates and chlorides that are prone to scale formation will be changed, making them less prone to scale formation during water heating and evaporation, thereby reducing the hardness of water and achieving the purpose of softening.

General process: The specific methods for softening water treatment include ion exchange method, heat exchange method, chemical precipitation method, and reverse osmosis method, etc