The tank has a nice sleek upright design and holds plenty of water. See photo and video upload. When the bottom tamk needs to be cleaned, you will notice a off-colored calcification or sediment. That's normal and that is coming from the water itself. It is not mold! I think people in some of the reviews are not familiar with the way these tanks work and have often given them bad reviews because they don't understand what it is they're seeing when it's time to clean out the tank. Of course the tanks need to be cleaned out once a week to make sure no bad mold or germs gets in them. It's not the design fault if people do not keep it clean like they're supposed to.
Anyway it's very quiet the only thing you can hear is occasional faint rippling sound as the water bubbles below in the lower tank. You really can't hear it unless you're up close.
The humidity adjustment switch is extremely sensitive. All the way open and your humidifier looks like a steam train. You can adjust the intensity and how much vapor comes out by a handy knob (which my other vaporizer never had). You can get very little or a lot by the eaay-turn knob.
There is a side door to put a vaporizer pad if you needed it. We don't need it. We just need the moisture in the air from being in a dry climate.
Where to put the vaporizer: The idea is to put it in a place where the vapor cannot negative impact wood floors or furnishings. I have it on a folded beach towel on my wood floors several feet away from a bookcase. In the bedroom we just sit it on the towel on the dresser. No problems with oversaturation because we can adjust the knob as needed.
I got it on Amazon when it went on a discount! Couldn't beat the price or pass up the deal. As far as its function goes I give it five stars!
So far so good! if there's anything less than a five-star out of this product, I will certainly update my review.