That said, I'd recommend either making your own OR looking for a good Combination Colloidal Solution to buy with specs that are more conducive with reality than what you've been trying. ie, the best and more effective CS I've used to date has been a predominant Colloidal Silver solution that ranks in the approximate 20ppm range. Of which, I take 2oz (as per body weight) per dose, three to four times per day, daily.
And so, based on this, I'd recommend making your own CS if you can pull it off. Otherwise, you'll be left having to buy it which could prove to be expensive.
PS. stay away from these so-called "true Colloidal Silver " otherwise known as "Nanoparticle OR microparticle silver solutions" as they are either too weak and/or ineffective against serious infections.