Russ;

One ounce per gallon of 5 ppm CS will do very well, since the silver
never deteriorates.

"Ole Bob"

Russ Rosser wrote:

>  ...through ceramic medium (Katadyn is .02 micron, sufficient to
> remove even harmful bacteria), what MINIMUM ppm is required to keep it
> steriile during long-term storage? --Russ


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