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  • Don't think it is that damaging at all:
    **
    Environmental effect of chlorine**

    Chlorine dissolves when mixed with water. It can also escape from water and enter air under certain conditions. Most direct releases of chlorine to the environment are to air and to surface water.

    Once in air or in water, chlorine reacts with other chemicals. It combines with inorganic material in water to form chloride salts, and with organic material in water to form chlorinated organic chemicals.

    Because of its reactivity chlorine is not likely to move through the ground and enter groundwater.

    Plants and animals are not likely to store chlorine. However, laboratory studies show that repeat exposure to chlorine in air can affect the immune system, the blood, the heart, and the respiratory system of animals.

    Chlorine causes environmental harm at low levels. Chlorine is especially harmful to organisms living in water and in soil.

    From here:
    http://www.lenntech.com/periodic/elements/cl.htm

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