HoMedics UHE-HDC4 Ultrasonic Humidifier Demineralization Cartridges<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Reduces mineral build-up and "white-dust" caused by hard water when used in ultrasonic humidifiers </span></li><li><span class="a-list-item"> Works with all HoMedics ultrasonic humidifiers with a capacity of one gallon and larger: UHE-OW14， UHE-WM85， UHE-WM65， UHE-CM25， UHE-CM45， UHE-OC1 </span></li><li><span class="a-list-item"> Simply drop one cartridge into water tank </span></li><li><span class="a-list-item"> Replace cartridge every 30-40 fillings， depending on the water hardness </span></li><li><span class="a-list-item"> Includes 4 cartridges </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/414-yY3Va6L.jpg" noproxy>