Advanced Filtration: Our filtration system improves air quality. The outer layer captures larger impurities, the ion exchange resin in the middle removes heavy minerals like calcium and magnesium, and the inner layer purifies the water to ensure a clean mist. Enhanced Humidifier Performance: By filtering out minerals from hard water, our filter element prevents scale and white dust, enhancing your humidification experience. This not only increases the efficiency of your humidifier, but also extends its life, making it a cost-effective solution. Recommended Replacement Schedule: To maintain optimal performance, replace your filter element once a month. This frequency may vary based on your local water quality to ensure your humidifier is operating at optimal efficiency. Color: As shown Material: plastic Package Contents: 2 x Filter element 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.