Product Details: Our upgraded WF813 humidifier filter replacement features a high-output, low-density honeycomb design made of environmentally friendly wood pulp fiber material. The mesh of the humidifier filter is not only fine and strong, but also of high quality and not easy to collapse. It is the same as the filter but with higher efficiency and lower pressure. Low Maintenance Cost: WF813 filter is washable and reusable, providing an economical and safe solution, the extra large surface area makes it easy to clean. WARM TIP: For best results, fill the humidifier tank with distilled water. Excessive use of hard water will reduce the performance of the filter and cause it to yellow prematurely. Therefore, we recommend that you replace your cool mist humidifier filter every 3-6 months for optimal filter performance (depending on your usage). Excellent Performance: wf813 humidifier replacement filter is highly efficient in capturing mineral pollutants in hard water, blocking white dust and retaining the mineral elements needed by the human body, ensuring that you and your family breathe clean and healthy air. Maximize the humidity output of your humidifier while relieving the discomfort of dry environments. Compatible Models: Our WF813 humidifier filter ensures that humidity is distributed more evenly and thoroughly throughout your home, taking full advantage of your home humidifier. Effortless Installation: Owing to the of these filters, replacing your old filter is a breeze. Simply discard the old one and fit this new one in its place. Filter WF813 compatible with R- WF813 RCM-832 RCM-832N, compatible with E-quate EQWF813 EQ-2119-UL,compatible with P-roCare WF813 RWF13 PCWF813 PCWF-813 PCCM-832N PCCM-840, compatible with K- WF813, compatible with S-esame S- SH100 and SH200, also compatible with D-uracraft / R-obitussin humidifier models -830, -832, AC-813, ACR-832, D13-C, -832 and more. Material: wood pulp fiber colour: White Package Contents: 4 x Humidifier Filter WF813 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.