How long does the filter last? The effective usage time of the filter depends on a number of factors: - Concentration of contamination - Breathing rate - Heat - Humidity - Hygiene factors. These factors depend on your location and different environment. As a role of thumb, you should change the filters when the white filter turns grey. The filter should be changed before the particulate overloaded. On the other hand it is recommended a filter should not be used longer than 2 weeks, even there is no signs of color change. More detail about the duration of use in Totobobo blog
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