Water is regarded as the source of life and is an indispensable part of our life, but now in our life, various kinds of water pollution have affected our life and caused very serious consequences for us, so, we need to know something about water testing. Water quality analysis is generally divided into three categories the first category: Metals and compounds detection. Water often contains metals, some of which are good for you, but too much of them can lead to micronutrient. The main substances in the water include: Silver, Mercury, sodium, magnesium, calcium, Barium, beryllium, cobalt, copper, zinc, cadmium and dozens of other. These metals, or their compounds, are sometimes needed in the human body when they are slightly bright, but now they are found in surprisingly large amounts in some water. There are reasons for this, one is the spread of pollution now, there is the impact of domestic waste. These are all hazards to people, so metal testing is imperative. Class 2: Biological Monitoring. These are mainly E. coli, ascaris eggs, and BIOTA. There are certain microorganisms in the water, and there are certain amount of microorganisms in the human body. The good microorganisms can help people digest, but the bad ones will affect health. Biological testing is part of keeping people healthy. Class 3: Organic matter. This category refers to oil or organic matter, chemicals that, once immersed in water, quickly dissolve into it, and the result is a sudden increase in the organic content of the water, which seriously affects people's lives, and for harmful organic matter, through the detection of timely clear, this is also urgent for people, can not let unhealthy water into the body.