I came down with a chest cold. I poured colloidal silver (16.5 ppm) into an ultrasonic humidifier and took 10 deep breaths then 10 through my nose. The next day the cold was almost gone. By the end of the next day it was gone. Now I’m just a diesel mechanic so this isn’t medical advice. I’m just saying what worked for me.
The Humidifier is called an “Ionic Mist Humidifier”. You’ll be able to find a couple different styles but the key is that it’s an ultrasonic humidifier.