What Kind of Water Do You Put in a Humidifier? | Water for Humidifier
Why You Shouldn't Use Tap Water in Humidifiers, Neti Pots
Don't use tap water in a humidifier in your apartment unless you want to coat the inside of your PC and other electronics in mineral deposits. : r/hardwaregore
Can I use tap water in my CPAP humidifier water chamber? - Intus Healthcare - YouTube
Update: and final post. It's not dust, it's dissolved solids from tap water in our humidifier. Thanks for the help! : r/DIY