1st of all, there is no such thing as "True Colloidal Silver ." That is marketing clap trap & mumbo jumbo used to brainwash consumers.
Next there are only 2 silver products out there:
1) Ionic Silver such as made with home generators and this list:
Ionic Silver Products are superior
Argentine 23 for Doctors - 95% Ionic
Advanced Ionic Silver
Utopia Ionic Silver
Good State Ionic Silver
Invision Silver Optisilver 100 - Theory Note 2
Sovereign Silver (Hydrosol) Note 1
Naturally Sourced Silver H2O
2) Particle Silver products such as Mesosilver & others.
You will also see many research reports that prove only Ionic Silver kills pathogens.
Ask me if I would waste $300 on a gallon of marketing hype and you know what I would say.
It is true that Mesosilver cured my own pneumonia, however I am convinced that it was actually cured by the 10% of ionic silver contained within the 90% of particle silver. I suggest spending that $300 for a quality home generator, or make your own per this link: https://www.youtube.com/watch?v=KgAgsS5h8is