What is meant by this sentence?

In this experiment, the final working concentration of 1.8 ppm is very close to
the upper limit of antibacterial activity.

Since when does silver have an upper limit of antibacterial activity?

Marshall

> I asked Mike for permission to post the following information...
>
> As readers may recall (how could you forget) there was a recent discussion
> on the list regarding the Natural Immunogenic study that claims to prove
> that only ionic silver can kill pathogens.
>
> Because we suspected there was something wrong with the design of the test
> protocol we had a professional review performed by EMSL scientists.
>
> The full text of the review is on the silver colloids web site here:
> http://www.silver-colloids.com/Pubs/bad-studiy.html
>
> Basically, the EMSL reviewer concluded that the study was bogus for several
> reasons which are explained.
>
> Frank Key
> www.ColloidalScienceLab.com
>
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