The effectiveness of colloidal silver is due to total surface area and is a function of both particle size and PPM. 3000 PPM colloidal silver is far, far more than is necessary - especially if you use superior quality colloidal silver with particles that range to below a nanometer in size. Two of the best true colloidal silver products have particles that are barely larger than two silver atoms, not 59 plus. Their effective surface area per PPM is vastly superior to large particle large PPM products. Most people who are truly well informed about colloidal silver will tell you that anything much over 20 PPM is overkill.
Interesting information about iridium and ruthenium though. I will have to check that out. Colloidal platinum has been effective against cancer and it is interesting to note that iridium was first discovered in 1803 in the residue left over when crude platinum was processed for better purity.