Homedics Demineralization Cartridges for Ultrasonic Humidifiers, 4-Pack Replacement, Reduces Hard Water Build-Up, White Dust, UHE-HDC4

It is a large capacity,which is good,as it doesn't run so fast out of water,and has all kinds of settings, and oil diffuser tray and quiet,but...the initial demineralization cartridge didn't sink,although i kept it 20 minutes, not 10 as the site recommends, so i have to buy new ones.And on a side note,one cartridge is not enough, as you need 2-3.Also,because it doesn't have filter,which is good as you save some money,the water comes out with all the bad stuff in it,so after 30 or so, fillings I started having mold allergy,and when i took it apart,the chamber was grey,instead of white,which was too fast,in my opinion to get the mold.I cleaned it with vinegar and I'm good now.All being said the room went from 16 humidity to around 40,and i feel much comfortable now.It is a good humidifier overall,that's why I gave 5 stars.It only needs more attention.

These cartridges purify the water that gets evaporated so that there is no deposit of calcium or mineral residues, i mostly use reverse osmosis water (cleared of most stuff) to fill my humidifier and occasionally refill with tap water, in this usage pattern i only needed 1 per year- i have not seen any residue or build up in my humidifier