[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 [High Quality] 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. [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. [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 new humidifier wick filter in its old position; 3. Install the cover to complete the replacement. [Humidifier Pads Refill] Content-humidifier filter replacement.