True Colloidal Silver or even Reduced Colloidal Silver made from Ionic CS is not effective against bacteria inside a biofilm which is their preferred place of residence. Biofilms are negatively charged and Ionic silver is positively charged and Ionic Silver is attracted to the biofilm and does not do anything to any micro-organisms inside the biofilm.
True Colloidal Silver or Reduced Colloidal Silver has not charge and therefore is not attracted to the biofilm, instead it can destroy the micro=organisms inside the biofilm.
I have tried Ionic silver and I have tried Reduced Colloidal Silver and Ionic Silver did absolutely nothing against a biofilm whereas Reduce Colloidal Silver destroyed the micro-organisms and eliminated the biofilm.
I wish these Ionic Silver lovers would stop posting garbage about how great Ionic Silver is because it is not!