Generators which produce silver in the colloidal form have been made in many forms throughout the years.

The MProCSG Colloidal Silver Generator manufactured by Kestar Enterprises continually monitors the production of the Colloidal Silver, shows the progress and switches the unit off when the Colloidal Silver reaches the 5-10 ppm concentration.

What is inside the other generators? Do they show you an inside photo? What are you paying for?
Checkout the MProCSG - you won't be sorry

If you would like a cheaper alternative, why not try the "Three Nines Plus CSG" Colloidal Silver Generator. This is a portable battery powered unit built to last. No flimsy alligator clips! Everything you need in enclosed in the case. The electrodes (same as MProCSG electrodes) simply plug into the base of the unit. Batteries are supplied.