DreoClean Mist Cartridge 3-Pack for Humidifiers, Compatible with Dreo Humidifiers HM311/311S/524/524S/306, Reduce Contaminants Build-up, Healthier Mist, Easier Cleaning

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.

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.

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

All humidifiers work best and are least trouble prone if distilled water is used. But a gallon of distilled water costs about $1.25 or so. Hence a month's supply (about 30 gallons) costs nearly $40. These cartridges, while seemingly expensive at roughly $6 each, last one month, and allow you to use tap water in your humidifier. So using them saves you well over $30 each month! They fit my Dreo 4L humidifier perfectly and are trivial to install. Highly recommended!

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

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.

We purchased two Dreo Humidifiers along with the Demineralization Cartridges. Glad we did! Hubby has a special filter he uses when he adds/changes the water in our hot tub. He is now filtering a couple of gallons of water to be used with the humidifiers. That filtered water along with the cartridges has made the humidifiers work fantascially. Weekly cleaning of the humidifers is a breeze. No build up; no "gunk". The humidifiers are just as fresh and new as when we purchased them. Will continue to use these cartridges. Excellent purchase!

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.