Drinking water contains a lot of chemicals, some of which are needed by the human body. Some drinking water is polluted and poses a threat to human health. Most of the substances in the water are not visible to us, and we can't even taste them. These substances include microorganisms such as viruses and bacteria, and other substances like salt, heavy metals, pesticide residues, and even radioactive pollutants. testing fluoride indrinking water https://www.alfachemic.com/tes....tinglab/industries/d