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WF2 Protec Type Filters for Vicks Kaz 3020, V3100, V3500, V3500N, V3600, V3800, V3850 , V3900 Features:  Also known as a 'wicking filter', a fan in your humidifier draws dry air through the moistened filter and re-circulates humidified air back into the room. During this process the air is simultaneously washed, trapping fine dust and air borne particles  The filter should always be replaced if it becomes discoloured or when the top is not moist to touch  Absorbs moisture and adds humidity to the air via your humidifier -- Traps fine dust and airborne particles -- Normal service life is approximately two months or 40 water changes (longer for occasional use)  Suggestions for use: It is recommended to maintain once a month. Using clean water, rinse the surface of the filter 2-3 times repeatedly. Do not flush with force Specifications:  Color: White  Applicable Model: for Vicks Kaz 3020, V3100, V3500, V3500N, V3600, V3800, V3850 , V3900  Optional specifications: 1 pack; 3 packs; 6 packs Package Include:  1 x Filters (PCS) OR  3 x Filters (PCS) OR  6 x Filters