Delfin D/G 1 Z22 Operating And Maintenance Manual page 42

Loosen the strip and remove the holding ring with the sheath.
Untie the knots, remove the pocket filter and replace it with a new one.
Reassemble the unit and finally lock the cover.
CAUTION!
The debris and dust deposited on the filter and the filter as well must be
disposed complying with the laws and regulations in force in the Country where
the vacuum is used.
D/G 1 – D/G 2 Z22 Edition: September 2005 – Rel. 00