Chloride is a natural poisonous gas that is soluble in water. It exists in nature and in small amounts in our bodies.
Our bodies need some chloride (in the form of the chloride anion) but over the decades, chlorine gas has been used by many water-treatment plants to kill microorganisms in the water. Many scientists are concerned with the high levels of chlorine in drinking water because it is thought to form toxic chemicals and carcinogens when combined with certain organic water pollutants.
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