Everyone can't live without water, So ensuring the safety of drinking water is a priority for every countries.

Nature gives us abundant water source through rivers,lakes or underground water. Most nature water is healthy, However, the water sources in different places vary according to geographical factors, For example, Some groundwater may have excessive fluorine, and some may have excessive arsenic. If left untreated, it will seriously harm to the human body.

With the intensification of human activities, the water quality of many rivers and lakes has changed, and a large number of deaths have occurred in aquatic organisms. If left untreated, it will seriously affect the ecological balance.

In some cities where rivers and lakes are used as main water sources, these waters usually enter the homes of residents, which requires strict water treatment to ensure the quality of municipal water supply.

In addition, farmland irrigation water is also closely related to people's lives. Although farmland irrigation water is not used directly by residents, farmland irrigation water with harmful substances, especially heavy metals, will not only affect the growth of plants, but also the enrichment of heavy metals in plants brings great hidden dangers to the later use of humans.

Every year, many people are diseased and even dead due to the problem water.