My new Silvertron Elite generator can make 1 gallon of 20ppm every day at the touch of a button. https://www.youtube.com/watch?v=lOKnp9Y54Ls
I will have no trouble running my Cool Mist Humidifier every night this winter, if needed.
There are several brands of colloidal silver generators that can make 1 gallon or more colloidal silver daily, all listed here: http://tinyurl.com/silver-generators