Thanks for the links.  What would one use to keep filtered water in a  200 
gallon storage tank free of bacteria or algae.  How about a 5,000  gallon metal 
storage tank?  Neither of these get any light on the inside,  so solar is out. 
 Would the algaebar put out too colloidal copper and  silver into this water 
(drinking water).  Would it be suitable for the  5,000 gallon storage tank?
 
Jill