Nilfisk-ALTO BSG81 - Manual (Page 12)

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Replacing the HEPA filter (Depending on version)
If your vacuum cleaner is equipped with a HEPA filter, you need to replace this filter
once a year.
Replacing the activated carbon filter (Depending on version)
If your vacuum cleaner is equipped with a HEPA filter and an activated carbon filter,
you need to replace the HEPA filter yearly and the activated carbon filter twice a year.
Fit a new activated carbon filter.
*Depending on version
Ⅲ Slide the filter frame under the two retaining ribs and
turn in the direction of the arrow until it engages.
Ⅲ Close the exhaust grille.
*
Remove the activated carbon filter by pulling the tab
and dispose of it.
*Depending on version
*