When is a new filter is needed?
Each filter is designed to last approximately one week, which aligns with the duration of the training protocol. As the filter reaches the end of its usable life, the substrate inside will gradually shift in color — from white to light purple — indicating the level of saturation.
The filter is considered fully expended when 80% or more of the substrate has changed color (see photo). Even if small areas remain white, do not use filters beyond this point. For optimal performance, hygiene, and safety, replace the filter once the majority of the contents have turned purple.