In the course of large old water supply network, tap water is polluted by many factors, such as material and operation of water supply network. Rust, sediment, colloid, bacteria, heavy metals, arsenic, fluorine and other harmful substances in tap water, which enter the body through drinking water and meals, pose a great threat to health. In addition, long-term drinking of slightly high-quality water can lead to a variety of diseases, because some tap water containing benzene and benzene homologues, as well as chlorine consumption products, are the cause of cancer.

In the course of large old water supply network, tap water is polluted by many factors, such as material and operation of water supply network. Rust, sediment, colloid, bacteria, heavy metals, arsenic, fluorine and other harmful substances in tap water, which enter the body through drinking water and meals, pose a great threat to health. In addition, long-term drinking of slightly high-quality water can lead to a variety of diseases, because some tap water containing benzene and benzene homologues, as well as chlorine consumption products, are the cause of cancer.