1.[Outstanding Filtration Performance for Fresh Air]: The HFT600 Filter T filters are made of advanced technology. They adopt an upgraded filter design and diamond grid structure, which can effectively filter out dust, pollen, and other small particles, allowing you and your family to breathe clean, fresh air and maximize the water output. Add 40-60% moisture to your environment to help relieve dry throat, dry skin and colds 2.[Applicable Model]: HFT600 honeywell humidifier filter, applicable to HFT600T, HFT600PDQ and T-type filters. Compatible with HFT600 series and HEV-600 series: HEV615, HEV615B, HEV615 W, HEV620, HEV620B, HEV6 20W, HEV6 15, HEV-615B, HEV-610W, HEV-620B, HEV 620W 3.[Customer Guarantee]: 365 day warranty !Risk shopping . If you have any questions about our filter t hft600 honeywell humidifier , please feel to us. We will try our to meet every customer. of the humidifier, because hard water will degrade the compatible humidifier filter. When the Filter T HFT600 absorbs minerals, it will become very hard, slowly unable to absorb water, and it will turn yellow prematurely. Note: Do not use bleach, soap or vinegar to clean the filter. (Please power off before installation.)