I also bought the sg6 and I am please with it....until I can across this web-site that talks about 20ppms are not enough and ionic silver is better:
http://www.invive.com/
http://www.invive.com/Rebuttals_new.html
Now I'm not exactly sure what to take. The site also states:
" Long term (repeated monthly) use of Electro-colloidal silver
suppresses your CD4 and CD8 immune system function."
http://www.xpressnet.com/bhealthy/truth.html
Soo confusing...and who do you trust?