Softens water quality to maintain an ideal pH balance, benefiting skin health and reducing PM 2.5 particles for respiratory protection. Prevents the formation of white dust in the humidifier and around furniture through an ionic demineralization process. Extends the lifespan of the humidifier by minimizing white dust buildup, which can lead to performance reduction and early malfunctions. Compatible with models HM311/311S, HM524/524S, HM306. This demineralization is designed to enhance your humidifier's performance by softening water and maintaining a balanced pH level. It effectively reduces harmful particles, ensuring a healthier environment for your skin and respiratory system. The innovative ionic process prevents white dust accumulation, making cleaning easier and prolonging the life of your humidifier. Compatible with various models, this is an essential addition to your home for optimal air quality. Color: As Shown Material: plastic Package Contents: 2*humidifier filter Only the above package content, 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 measurement allowed error is +/- 1-3cm.