Thats just silver oxide I think which forms on the rods when the process is 
going on.  I use reverse polarity which cuts this to a minimum.  dee

On 28 Jul 2010, at 15:48, needling around wrote:

> Hi,
> Does anyone know what is landing on the bottom of my CS bottle (inside)? It 
> was perfectly clean and clear the day I made it but over time it keeps 
> getting specs of something black on the bottom.
>  
> Thanks.
> PT


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