Compatible with Walgreens 890-WGN, 890WGN, LEV320, HF212-UL Cool Mist Humidifier, W889-WGN Replacement. HQRP® Humidifier Wick Filter improves the efficiency of your humidifier by trapping mineral deposits from the water. This triple-layer humidifier filter helps control dust and dirt build-up and prevents impurities from spreading by passing air through the filter, also remove household odors. Additional outer blue pre-filter layer helps capture large airborne particles from the air that passes through the filter. For optimum performance, humidifier filter should be replaced at the beginning of each season and then every 4-6 weeks, depending on usage and hardness of water. Disclaimer: This is not an Original Equipment Manufacturer (OEM) product, HQRP branded product is a replacement. All brand names and logos are registered trademarks of their respective owners. Any use of the brand names or model designations for this product are made solely for purposes of demonstrating compatibility.