Depending on your air quality and how often you use the air purifier, it is recommended to change the filter every 6–12 months. If the air purifier is used in an area with excessive exposure to pollutants (fur, dust, smoke, etc.), the filter will get saturated quickly and you may need to change it more frequently.
As a reminder, the “check filter indicator” light will turn on when it’s time to check the filter and clear any dust buildup. This reminder light is based on a timer, not the quality of the filter.