Emergency Water Disinfection

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ANTI-AGING TIP OF THE DAY

Emergency Water Disinfection

In the event of a natural disaster, which may compromise your access to
water from your tap or bottle source, follow these techniques to purify
water for drinking:
  * Boiling -– vigorously, for 10 minutes

  * Bleaching -– add 10-20 drops of household bleach per gallon of
    water, mix well, and let stand for 30 minutes.  A slight smell or
    taste of chlorine indicates water is good to drink. (Note: do not
    use scented bleaches, colorsafe bleaches, or bleaches with added
    cleaners.)

  * Tablets -– commercially available purification tablets

  * Solar disinfection, known as SODIS -- a new technique developed by
    researchers at the Swiss Federal Institute for Environmental
    Science and Technology.  Clear plastic bottles are filled with
    water and left in the sun.  The heat warms the water and the
    combination of warm water and ultraviolet radiation kills most
    microorganisms.  The Institute’s tests showed that 99.9% of the E.
    coli in a sample of contaminated water were killed when the sun
    heated the water beyond 122F (50C).  At that temperature,
    disinfection takes about an hour, but placing a corrugated metal
    sheet under the bottle can shorten the time.  Additional tests
    demonstrate SODIS as an effective approach for killing the cholera
    bacteria, Vibrio cholerae, and that it could inactivate parasites
    including the diarrhea-causing Cryptosporidium.

"One of the tests of leadership is the ability to recognize a problem
before it becomes an emergency." ~ Arnold Glasgow


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