We humidifier filter, made of natural fabric, multi-layer mesh surface to maximize the output of humidifier moisture, also better filter Limescale, the new upgraded material makes the filter more stable and filtering, can be used for a time. Including for Relion WF813 RCM-832 RCM-832N,for PCWF813 PCWF-813 PCCM-832N PCCM- 840,for EQ-2119-UL,for SH100 & SH200,also compatible with for / Robitussin humidifier models -830, -832, AC-813, ACR-832, D13-C, -832, etc. Easy Installation,Remove the old filter in your humidifier, put this brand new humidifiers filters in place and adjust it well. Normal use 1-3 months need to be replaced with distilled water or cold water to fill the tank, not hot water. Made of high quality material, more durable. Replacement Filter:A dirty filter will greatly reduce suction power. Depending on the vacuuming frequency and amount of dirt cleaned, for best performance, change the filter at least 3 to 6 months. Product Name:WF813 Humidifier Filter Type:Filter Type:for Relion RCM-832 RCM-832N Protet WF813 :18PCS Colour:White Material:plastic Package Contents: 18 * Humidifier Filter 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.