I have a question about the filters. I have often read that the original activated carbon filters are used up quickly (as they are probably only moderately filled) and that it is therefore better to use filters from alternative suppliers. But my feeling is that the condition of the filter is not measured, but simply tracked by a timer. This is because the filters always wear out in the same way, regardless of whether I run the device in turbo mode or sleep mode. So how can the alternative AK filter last longer? Do you simply reset it when the message appears and does it need another cycle? What are good alternative filters?