[EXCELLENT FILTRATION EFFICIENCY]Our advanced humidifier wicking technology changes the filter to a brownish color, indicating that it's working! This helps improve sleep quality and creates a more comfortable environment by reducing dry air [PREMIUM QUALITY MATERIALS]This humidifier filter is crafted from high-quality paper, and wood pulp materials. It maximizes water absorption, ensuring optimal humidity output for creating a comfortable home environment []humidifier replacement filters work seamlessly compatible with for Canopy Bedside & Nursery Humidifier ONLY. They efficiently treated large particles, providing a cleaner and enhanced humidification experience [WARM TIPS]For optimal performance, we suggest replacing the humidifier wick filter every 6 weeks, based on your usage and environment [NOTE]Any residue or discoloration on the filter is a result of impurities in the filtered water.