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As a side result of using an ultrasonic air humidifier, this white dust thing can be seen on house furniture during its activity. I googled about it but I only found a few articles, saying that it is safe for human body but I found nothing about house devices. Does it have any bad effect on my LED TV? I use a homemade cover for it but, I'm still kind of worried.

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    \$\begingroup\$ I would not trust the web regarding human safety. Worry about yourself before you worry about your possessions. Use distilled water in the humidifier (buy at local drug store) .... as far as safety for electronic devices, probably not safe if water contains dissolved salts. No idea about other minerals, but i guess that any iron content could cause degradation in electronics performance. \$\endgroup\$ – jsotola Jan 1 '18 at 20:05
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    \$\begingroup\$ If you're covering your TV, I'd be concerned about it overheating due to lack of airflow. \$\endgroup\$ – jwygralak67 Jan 1 '18 at 22:02
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    \$\begingroup\$ @jwygralak67 Hi there, I'm not using cover when TV is on. Usually, I try not to use humidifier when the TV is on. \$\endgroup\$ – Vynylyn Jan 2 '18 at 6:05
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Ultrasonic humidifiers have a way of vaporizing that causes the lime sediment in water to evaporate and condense on any nearby surface unlike steamer and spin drum (hot & cold types) .

A demineralization water filter can work.

Lime can be harmful , long term , to lead solder joints in copper plumbing, so water softening is recommended to remove the minerals. Boiling water will also leave a white sediment in kettles, coffee boilers and cooking pots, according to how “hard” the water is.

Lime is not conductive or very salty as far as ionic levels are concerned so it will be harmless when dry.

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  • \$\begingroup\$ Evaporating lime would be impressive. In reality, dust is created when an impure water droplet evaporates, leaving a small speckle of dust behind. \$\endgroup\$ – MSalters Jan 9 '18 at 15:01
  • \$\begingroup\$ It is the corrosive stuff on copper pipe solder joints caused by hard water and prevented by a water softener.. Perhaps it depends on location but I was thinking of calcite from limestone \$\endgroup\$ – Sunnyskyguy EE75 Jan 9 '18 at 15:36
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White dust:
https://www.hvac.com/faq/white-dust-concerned/

White dust is usually caused by mineral content in the water that goes into a humidifier. When the mist lands on furniture or other surfaces and dries, it can sometimes leave behind the dried mineral deposits, or “white dust”.

The dust is a salt (ionic compound). The dust should be safe when dry, but as soon as it absorbs moisture it will become electrically conductive.

I would be more concerned about the liquid water that appears before the dust.

You could use distilled water as suggested by @jsotola to avoid the issue altogether.


I was wondering for myself a moment why "normal humidity" doesn't cause the white dust, but only the humidifiers do:

Ultrasonic humidifiers work by splashing water everywhere, the same thing you can do with your arms in water, the only difference being the size of the droplets.

So you should definitively use distilled water as the humidity from an ultrasonic humidifier is basically like splashing water on electrical appliances.

Tiny droplets of distilled water shouldn't be much different from normal humidity which generally isn't an issue.

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  • \$\begingroup\$ @Oslar Skog Hi there, You wrote: "I would be more concerned about the liquid water that appears before the dust." Is it wet when it's being absorbed to the surface or is it just dry dust that is absorbed to surfaces due to its ionized nature? I'm asking this because there's a considerable distance between humidifier device and TV that makes me think that it must become dried out before reaching TV surface or am I wrong?! \$\endgroup\$ – Vynylyn Jan 2 '18 at 6:11
  • \$\begingroup\$ The article suggests that the water dries up and leaves the white dust behind, so I assume it may be humid when adsorbed to surfaces. But I don't know. \$\endgroup\$ – Oskar Skog Jan 2 '18 at 8:33
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    \$\begingroup\$ Tiny drops of water are still that, drops of liquid water. Humidity in the air is different, it is not liquid. The tiny drops will conduct and depending on the circuit damage it \$\endgroup\$ – PlasmaHH Jan 2 '18 at 9:47

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