Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: We had ultrasonice humidifier for years. The problem was when we use it for a while the surface of our home had white dust. Does this like that?
Document: This humidifier works quite well. Of course you've read the info and know that you may experience white dust if your water is high in minerals. This means that it could clog up your furnace filters so watch for that. I use mine with RO water. One problem I have is that the tank is not flat on the top hence it does not sit well in the sink thus making the refilling of the tank very awkward as it wobbles around.
Using this humidifier for me is EXPENSIVE!! I came home one day and the sun was hitting the room just right. My whole studio apartment was FILLED with a HUGE cloud of white dust in the air. I could hardly see out my window. Upon further inspection, I found white dust on everything!! I contacted the seller and they just told me to use distilled water because there was probably something in my apartment water supply (city water).
I purchased this for a vacation home in Wyoming where winters are extremely dry. While this unit does get moisture into the air we began to notice a white dust or film on many surfaces in the house. We followed the manufacturers maintenance as laid out in the manual. Just an aside at this point: The maintenance is expensive and time consuming. This would have all been worth it if not for this white film on everything.I wonder why the won't answer emails? Why do they want me to call?
the best humidifier I have ever owned. The only downside is it leaves a white film but am told that if I use distilled water that won't be a problem. Very satisfied
I had originally wanted a larger until that I would not need to refill for days, but I am very happy with this size. My last unit was such a hassle I hated to refill it. Not really an issue with the 7147. This unit is also relatively quiet. It's not silent by any means, but there is no loud on-and-off fan noise like I had in my previous humidifier. I'm not sure yet how the filter will work yet, but so far no white dust.
This is a great humidifier....low on the white dust. That being said the manual and instructions on it are a little overwhelming. It does require more setup and continued maitenance but we noticed a huge difference when it was in use.
It works really well except for the fact that if you have it on higher than about 20% output, it will pool a couple of feet away. I'm assuming the angle is too low and the mist never has a chance to get any higher than when it was spewed out. It blows out the mist almost horizontally. If you use it next to the bed, it will soak your bed. I used it for like two years, had to put up with it because its an expensive humidifier.
Without it the room feels cool and damp. Even with using it there is a bit of a cooling effect, but it is acceptable.Filtering/water treatment: We did not see any white dust around the unit, which was a concern.Reliability/ease of use: No problems so far, straight-forward to operate, everything works as intended.
My unit produces the &#34;white dust&#34; referenced on page twenty of the instructions. I have a well water system.As far as I can determine, my only solution is to use distilled water. That raises the cost to operate my unit tounacceptable levels. This dust is so pervasive that it will clog my furnace filter in a few days.Very unhappy with this result.
You can set it to any level from 30-80%. All of the other functions/features work exactly as advertised. I've had many humidifiers and all generated the white dust with regular water so I've always used distilled water. I removed the demineralization cartridge and still use distilled water with this one so i cannot state how well this cartridge works. I prefer distilled water as I don't want even a trace of white dust and I also want to minimize cleaning.
Answer: We live in Florida and have very hard water. We have followed the instructions EXACTLY, and have yet to have "white dust". Be sure to change the cartridge (which screws onto the water tank cap), as per instructions. We really LOVE this humidifier!!