I consider the following the best colloidal silver generator for after PS use. 

Be sure to get the 12 Volt DC Battery adaptors with the unit. Ask for the 
regulated adapter that can be used in a cigarette lighter or RV, additionally, 
there is accessory to battery clamp attachment so that it can be clipped 
directly onto 12 volt battery terminals. This cost about $19 extra.

The Colloid Master Model 777 Universal - Make sure it's the "universal" model 
and not the "AC" model.
http://wishgranted.com/Colloidal_Silver_Generator.html

