I doubt that your Silver Gen supplies silver is of lower quality; the best is Silver bars made by Canadian mint with 99.9999% purity.
While low grade silver has all kind of other unwanted heavy metal. Silver is noble metal not heavy metal.
Another point of ineffectiveness is likely voltage is too high, lower the voltage make nano silver, compatible if silver particle is too large is not effective. Only nano size Colloidal Silver size is similar to those germs, and make germs stop their metabolize function and dies.
What is the color of your Silver Gen fluid, does it look amber? dark amber, slightly amber?