Usage Tips:[Compatible] HFT600 Humidizer Wick Filter, applicable to HFT600T, HFT600PDQ and T-type filters. for HFT600 series and HEV-600 series: HEV615, HEV615B, HEV615 W, HEV620, HEV620B, HEV6 20W, HEV6 15, HEV-615B, HEV-610W, HEV-620B, HEV 620W [] The humidifier wick filter made of the highest quality materials, this filter wick is sturdy, fine, and multi layer mesh, natural hydrophilic fabric multi-layer mesh maximizes the moisture output of your humidifier. [Easy Installation] We advise you to fill the humidifier tank with distilled water instead of hard water. Easy to replace, 1. Open the humidifier cover and the old wicking pad 2. put the humidifier wick filter in its old position 3. Install the cover to complete the replacement. [High Performance] For best performance, it is recommended to repalce the humidifier pads every 2-3 months, depending on usage and water hardness, It captures mineral from hard water and distribute moisture more evenly and thoroughly throughout your home. [Humidifier Pads Refill] Content-humidifier filter replacement. Material: wood pulp paper colour: white Package Contents: 6 x humidifier replacement filters Replacement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.