Usage Tips:1.Exquisite workmanship and high working efficiency. 2.washable, ensures noticeably better air quality, long-lasting suction performance, protects against pollen, dust and allergens 3.The humidifier filter can effectively filter particles, bacteria, dust, etc. 4.Regular Filter Replacement: For optimal filtration and strong suction performance, regular filter replacement is recommended 5.RECOMMENDED REPLACEMENT: It is recommended to replace the filter every 4-6 months to ensure optimal results. Filter name: Humidification filter Filter effect: remove impurities, calcium and magnesium ions from water, purify water quality, etc. Replacement cycle: 6-12 months Applicable models: Suitable for balmuda Rain ERN1000/1080/1180 humidifier Color: Blue Material: plastic Package Contents: 2 * Humidifying Filter 4 * Gasket Only the above package , 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 allowable measurement error is +/- 1-3 cm.