[Compatible] For -300 series: -300T, -305T, -310T, -315T, -350, -350B, -350W, -450BCST, -500 Series: -530, -535, -535-20, -540, -550, -550-19, -551, -560. -600 Series: -630, -631, -632, -632TG, -635, -640BW, -645, -646, -650, -700 Series: -710, -1000 Series: -1000, -1000C, -1010, -2000 Series: -2000C, -2001, -2002, -2020, -2050, -2051, HCM2052, HEV-312, HEV-355 [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. [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. Colour:As Shown Material:wood pulp paper Colour:White Material:wood pulp paper 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.