Bosch BSGL4000GB Instructions For Use Manual page 14

Changing the dust bag and filters
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Clean the motor protection filter by tapping it.
If it is very dirty, the motor protection filter should be rinsed out.
The filter must then be left to dry for at least 24 hours.
After cleaning, slide the motor protection filter into the vacuum cleaner
and close the dust bag compartment lid.
Caution: The vacuum cleaner must not be operated
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without the motor protection filter.
Replacing the HEPA filter
If your vacuum cleaner is equipped with a HEPA filter, this should be
replaced once a year.
Open the dust bag compartment lid.
Release the Hepa filter by moving the locking lever in the direction of
the arrow and remove it from the vacuum cleaner.
Insert the new HEPA filter and clip into place.