Humidifier Replacement Filter: Compatible with Levoit ultrasonic humidifiers in LV600S, LV600HH, OasisMist600S, Superior 6000S, Classic160, Dual 200S, Dual 150, Classic 300, Classic 300S, and OasisMist450S model series. Please confirm your humidifier model before purchase. Filtration Function: This replacement filter is designed to capture and filter fine impurities and particles, reduce water hardness, and help prevent white dust from being released into the air. Helps maintain efficient humidification performance for healthier indoor air. Value Package: Each pack contains 20 replacement filters. It is recommended to replace the filters every 15 to 30 days depending on water conditions. Regular cleaning of the humidifier is also advised for optimal operation. Note: Due to lighting and screen settings, the item's color may vary slightly from the images. Slight dimensional differences may occur due to manual measurement. Color: As shown in photo Material: Filter cotton Package Contents: 20 x Humidifier Replacement Filters