You should replace the filter in the recirculation version of your BORA Pure after about 150 operating hours.  The unique BORA eSwap system on the compact appliances BORA Pure, X Pure, S Pure and M Pure makes it possible to replace the filter without having to remove any drawers or plinths. Instead, simply remove the air inlet nozzle, stainless steel grease filter and filter replacement flap. You can then use the strap on the activated carbon filter to easily twist it to the left and lift it out of the air inlet opening. The symbols printed on the new filter make it easy to insert.A function integrated into your BORA Pure automatically counts down the number of operating hours and displays an ‘F’ in the fan’s indicator area to notify you when a filter change is due.