Product review (4 stars): slight smell but overall works great
It has a little odd smell to me once you add to the water and the humidifier is going but after a few minutes you can't smell it. Everyone else in the household cannot smell it. But I'm the "Freaky sensitive" smeller of smells in the house...its my super power. I use a 5 cc syringe to put the solution in the humidifier its almost perfectly a capful as recommended per instructions. I still air out my humidifier every other day and let it dry completely. But I have had no problems with algae or bacteria looking sludge at all. So I think it works great. But it does have a very slight smell.