Luella,
Thank you.
Having done some search, I now also came up with Utopia-Silver as the best choice. First, I was going to order Mesosilver because it was was rated as the most effective in http://www.silver-colloids.com/Reports/reports.html#CompTable
, but then I found that silver-colloids.com and purest---colloids.com (who makes mesosilver) have the same owner. So, I figured I'll pick #2 in their chart, which is what you suggested.