Product review (4 stars): Good for Keeping Your Humidifier Germ-Free
I have a humidifier that I use to protect wooden musical instruments. When I first set up the humidifier, I would find a brown scum in the base when I refilled the tank. After adding this product, the brown scum is gone. I don't notice any smell or other indication that I'm using it. This product doesn't impact the white dust that ultrasonic humidifiers generate.