Usage Tips:[Compatible] These WF813 humidifier replacement filters Replacement for WF813; for WF813,RCM-832, RCM-832N; for WF813, RWF813, PCWF813, PCCM-832N PCCM-840, AC813; for EQWF813, EQ-2119-UL; for SH100 & SH200; for -830; for -832, ACR-832, D13-C, -832 [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. [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-4 x humidifier filter replacement. Filter size is 5.6 x 3.75 x 1.62inch. Colour:As Shown Material:wood pulp paper Package Contents: 4 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.