It sort of depends on how much gunk you have in the water. If it is clear,
then an ounce or so should do nicely.  If it is like swamp water, a
significantly larger amount would probably be required, since much of the CS
might react with the gunk present and reduce it's effectiveness.

Marshall

"Carlos PĂ©rez" wrote:

> Hello, friends,
>
> How much 14 ppm EIS should be used to purify 1 gallon non potable water in
> emergencies?
>
> Thank you.
>
> Carlos
>
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