"ja...@tir.com" wrote:

> Hi Marshall,
> The metal form of silver used in water purification systems is
> releasing ions into the water.  Either through natural forces for very
> small ppb amounts or elctrochemically for larger concentrations.  The
> system on the shuttle was called the "advanced prototype silver ion
> water bactericide system", this was back in 1976.  In 1973 Russian
> scientists determined that ionized silver provides the safest and
> longest lasting method of purification. Silver impregnated carbon
> filters coated with silver release small amounts ions into the water.
> All referenced from The Silver Institute
>
> Rob

Thanks for the additional information. I was not aware of that.  I
believe that the water filters that you can purchase that have embedded
silver do still work without the ions though.

Marshall