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 filter every 15 to 30 days depending on usage and water hardness. Regular cleaning of the humidifier is advised at least once a week to ensure optimal operation. Note: Slight color variations may occur due to lighting and screen settings. Minor dimensional differences due to manual measurement are possible. These variations do not affect product performance. Color: As shown in photo Material: Filter cotton Package Contents: 20 x Humidifier Replacement Filters