When my children are sick I try every method possible to help with their cold symptoms. Having a 2 and 3 year old, it makes it even harder to help cold symptoms because there's not alot of cold medicines for them. About 3 months ago my middle daughter age 3 started off with what I thought was a simple cold. I bought the Vicks Warm Mist Humidifier because the ones I had at home weren't helping her. I felt this particular humidifier offered more, so I was hopeful it would help her breath better. I used the medicine cup that's included, added Vicks Vapor Steam to the water, and filled the container which holds 1 Gallon. It has 2 settings, and has an auto shut off option. The first time I tried it i couldn't tell if it was working or not, the machine was that quiet, after about 5 minutes I could smell the vapor steam and could see the mist. I noticed a difference in the air fairly fast, of course it took some time to help my 3 year old, her cough was still present but I knew she was inhaling the extra moisture she needed for her dry cough. I ran it all night without refilling which was about 12 hours. It automatically shuts off when it runs out of water, and refilling is easy. My favorite aspect to this machine is it doesn't have a changeable filter! There is a built in filter that cleans easy and catches dirt and other contaimanents. I highly recommend this warm mist humidifier, I use it even when my family is cold free, it adds moisture to the air, and helps all of us breath easier.