性色AV官网永久免费,国产一区二区精品福利地址,国产一区二区美女视频,www.com黄片,亚洲精品免费在线,欧美97色伦欧美一区二区日韩,日本午夜在线观看播放,妻中蜜精品在线观看

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