I've had a lot of success with the one I have. I've used it almost daily for the last eight years. I think mine came from a company in Canada called Sotta or something like that.
I've used it to kill the bacteria causing arthritis, heal wounds, help with knee problems I had and best of all to create Colloidal Silver . I've never had the "mud" that the above person says they had.
When making Colloidal Silver make sure to remove the silver and wipe off during the process. And of course use 4-9 silver and not jewelery silver.