HoMedics Demineralization Cartridge for Ultrasonic Humidifiers – 4-Pack Humidifier Filter Replacements, Filters Mineral Deposits and Purifies Water in Air Humidifiers for Bedroom, Plants, Office Blue

These work well. They do keep the mineralization of the water from being sprayed out onto your furniture. Just be sure to change them when time to do so. They aren't miracle workers but they do work quite well.

They work, l have been using tap water in my humidifier with no problems.

While I use filtered water with these cartridges they do appear to reduce the remaining lime and red iron content in my well water. It would be really helpful if these had some sort of color changing feature to indicate when they should be replaced as I haven't been able to tell if a month, 3 months, or even 6 months is time to replace.For the price they seem to be useful so I'll continue adding one to my ultrasonic humidifier. I have tried other manufacturers and some were barely more than a little charcoal and a little polymer - these cartridges are nearly full with a small sachet of what appears to be polymer (swells when soaked in water). So I recommend buying these if you have used in the past.

I would say way of price, but hopefully it’s doing what it’s supposed to do.

Worked well with my humidifier

So impressed with these. My humidifier was constantly gross from build up. Put on of these little filters in and my humidifier stayed clean. You can tell when it’s time to change it because your tank will get a little dirty but nothing at all like before. Can’t recommend these enough!! Very impressed with the quality and price. I would imagine based on the size they would work in most brands.

The media could not be loaded. U can't tell the size by the pics they provide_check out my pics_ i measured these at approx 1 1/2" long and approx 1/2"-3/4" wide.U have 2 soak these in water for 10 minutes b4 putting in your humidifier tank_ i included 13 pics -and a video__ showing the size_ showing the package insert/instructions, etc.they R smaller than a stick of gum (length-wise)_ they R approx the size of 2 quarters laying side by side__SEE PICS and VIDEOU will also see these side by side with the Air Innovations demineralize filters/-container caps_HoMedics UHE-HDC4 Ultrasonic Humidifier Demineralization Cartridgesi have an Air Innovations ultrasonic humidifier- they sell 2 larger filters- that are also the screw on/off caps for the water containers_they cost $20_ and only good for approx 45 days use_ these smaller ones by HoMedics say that they R good for 30-40, tank fills - 1 gallon tank size.Air Innovations Demineralization Filters (2-pack)you need these filters if you have hard water- water with a higher mineral content that causes white dust in the room you keep the humidifier in- the kind of humidifiers that create mist- the minerals R in the mist- so when the water vapor evaporates into the air- the white mineral dust settles on all your stuff in the room.U can purchased a TDS (total dissolved solids) meter 2 measure the softness/hardness of your water_ i purchased 1 on amazon for $8 _ it also takes the water temperature.having a water softener does make your water softer- but it doesn't reduce TDS_ only a reverse osmosis water filter will remove almost all TDS from your waterXLUX Digital TDS Meter, Water Quality Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracyi found a chart that shows what TDS numbers mean soft/hard water:the United States Geological Survey uses the following classification into hard and soft water,Classification hardness in mg/L (or parts per mill)Soft 0–60Moderately hard 61–120Hard 121–180Very hard 181 ≥my tap water is only 100-ish TDS_ which is considered moderate hard_ the water isn't hard enough 2 leave rust stains or mineral deposits in the bath tub, sinks or toilet- and the water tastes fine_ so no indicators of hard water except for when using an ultrasonic humidifier, i was getting white mineral dust residue in the room i have the humidifier in__ so i ordered the TDS meter and discovered i had moderate hard water. approx 100-ish.the instructions on ultrasonic humidifiers say to use distilled water if U have hard water_ at $1.50-ish or more a gallon- that gets expensive_ especially if U have 2 use it every day for several months in the winter.__2 gallons a day__ so with my water being only moderate hard- i can use these filters and fill the tanks with 1/2 distilled water and 1/2 tap water. _ or i can constantly dust every surface in the room- along with vacuuming the carpet every day..i've been using these approx a week_ i have an Air Innovations dual tank ultrasonic humidifier_ i purchased their more expensive demineralize cartridge/container-caps_ which only work with Air Innovation products_ and i put 1 of these small HoMedics demineral cartridges in each tank_ and using 1/2 distilled and 1/2 tap water for the 1st couple days of the week (i only bought 2 gallons)_ and approx 4 days using just tap water and these cartridges (along with the built in filters on the water tank caps)__ and there is no noticeable white mineral dust build up after 1 week.. i'm keeping track of how many times i fill up the tanks and i'll try 2 update this when the cartridges stop working and white dust starts showing up...these seem 2 B working in my ultrasonic humidifier_ but my tap water is only mild/moderate hard_ i didn't even know i had hard water till testing it (and the white mineral dust deposits)__ i hope these can also help U_ if U R not sure U have hard water_ buy the $8 TDS meter i mentioned aboveI hope some of the info/vid/pics i shared has been helpful 2 U_

Some of these came with the purchase of my ultrasonic humidifer. After awhile they need to be replaced. I didn't until I noticed a white dust over everything. These little capsules really help to reduce that white dust.