Hi Sol,
 
Some people are "purists" and bend over backwards to eliminate something that 
will not hurt them. The Britta is a good filter.
 
If one just lets the EIS sit quietly for several hours any large particles with 
fall out anyhow. Another good way to get rid of particles is to place the EIS 
in a freezer for a day and them thaw it. All particles will be in the bottom of 
the container .
 
You could also wrap the cathode with a piece of white paper table napkin and it 
will hold the silver oxide that is formed.
 
Another solution wold be to vacuum out gas the DW before use so there will be 
no oxygen to make silver oxide.
 
"Ole Bob"