In a message dated 5/21/2010 6:35:24 P.M. Eastern Daylight Time,  
[email protected] writes:

_www.blindguru.com_ (http://www.blindguru.com/)  carries them and  
discusses why there are different sizes, and which size you should buy.   They 
use 
to have a youtube video about them, too.  Very trustworthy site,  afaic.
 



There was someone on one of the lists last year that said he  put the beads 
in his drinking water.. I can't find the post but he said it had  
value---What,, I can't remember...{{ Maybe it would be good for CRS  }}   Lois