Impurities and Sediments
The water transmission distance of the water supply pipeline network is long, and the disrepair and damage of the pipelines lead to secondary pollution of tap water quality, which makes the quality of terminal water and factory water significantly different; a large number of bacterial corpses killed by tap water disinfectants still remain in the water.

Chemical pollution and heavy metals
Refers to chemical pollution in water bodies, such as pesticides, synthetic detergents, heavy metals, organic compounds, etc. At present, it is difficult to remove chemical pollution in water bodies through conventional treatment processes in water plants, and it cannot be removed by boiling the water.

Lead
Most domestic water transmission pipe networks use galvanized iron pipes, and the materials contain too much lead, causing the water to contain too much lead. Excessive lead will damage the central nervous system and affect children's intellectual development and concentration after being ingested by the human body.

Bacteria and sporangia
Due to poor daily management, secondary water supply equipment or ground pools cannot be cleaned in time, causing bacteria to multiply and directly endanger people's health.

VOC
VOC is the abbreviation of Volatile Organic Chemicals, which means volatile organic compounds. Tap water is usually disinfected by chlorine. The combination of residual chlorine and organic matter in the water will generate chloroform, octachlorobenzene, dichlorobenzene, methyl tert-butyl ether, Benzene and other carcinogens.