Dreo Demineralization Cartridge 3-Pack for Humidifiers, Compatible with Dreo Humidifiers HM311/311S/524/524S, Prevent Mineral Build-up, Filter Hard Water, Eliminate White Dust

Definitely minimize calcium dust.

These filters really cut down on the staining and hard water spots in our humidifier. The filter last for sometime and you can keep try on its life through their app, which is useful. They weren't too expensive for the value.

So how do you know if this demineralization cartridge works? I suppose if you don’t see a lot of white powder or other unacceptable things in the Dreo tank it’s working.I honestly don’t know if is does anything for me since I use only distilled water. No matter, I don’t want to breathe in anything that shouldn’t be in the tank.I purchased two packages of three each so I’ll replace them when the humidifier signals a change is needed. I figure it’s some protection for your furniture as well as what you breathe, so I’ll continue to use them.

After several weeks of use, it is obvious we get lots less mineral dust from our humidifier. Not perfect, but a whole lot better.

Top notch. Easy to use, clean and install and i like the design because its very long lasting and has no leaks and provides great filtration of humidity.

First they took 3 weeks to be delivered. I have hard water so hoped they would help, but if anything the white film on stuff is as bad if not worse than with the little filter that comes with the humidifier. And now only about 1 month max, the thing stopped the humidifier from working - wasn't letting enough water thru I think. That was on the lowest setting almost all the time. I put the little filter back in and it works fine again.

I bought these for my Dreo humidifier! I have not seen any dust or film on anything from the humidifier! Easy to install!

Helped with white dust from humidifier. Didn't completely eliminate it, but was much better than without it.