What to do if the water in the Mijia Smart Evaporative Humidifier Pro turns yellow?

This is caused by impurities in the air and water trapped by the filter in the Mijia Smart Evaporative Humidifier Pro being carried into the water tank by the circulating water. This is normal and can be simply cleaned without affecting your use.
For your reference, here is some information about cleaning the water tank:
1. We recommend cleaning the water tank once a week, depending on your needs.
2. After pouring out any remaining water in the water tank, rinse the water tank one to two times with clean water.
3. Regularly check and clean or replace the filter to prevent buildup of impurities and maintain optimal humidification performance.
4. Do not leave water in the tank for extended periods, as this can increase discoloration and bacterial growth.