日本不卡一视频在线播放,欧美日韩一区二区亚洲,国内熟女在线精品国自产在线,女同中文字幕一区二区

Concept: Pure water treatment refers to the process of treating tap water or other water sources through a series of processes to remove impurities, harmful substances, and microorganisms, so as to achieve the standard of pure water. The main purpose of pure water treatment is to provide safe and pure drinking and domestic water, meeting people's requirements for water quality.

General process flow: raw water pretreatment → filter - reverse osmosis equipment → reverse osmosis equipment