Your Atmos exhaust system display shows the value “Filter”. This indicator shows the level of filter saturation; in other words, it indicates how much of the filter has been used and when it needs to be changed. When it reaches 100%, the filter must be replaced.
Don't worry, at 10% filter saturation you have the same suction as at 90%. The system automatically regulates this. Nevertheless, the filter must be replaced once it is “full."