A friend recently started making EIS with the same one I have used for 15 
years.  He has been making it for a good year now with the same kind of 
generator.  He just made a batch and noticed a particle that was obviously 
silver in the bottom of the brew jar that measures 3/8 long X 1/8.  Plus when 
he wiped out the brew jar there were tiny specks of silver on the tissue.  I 
have never had this experience.   He is brewing at the 10 PPM level.    Ode???? 
 Bob Smith