CITROEN DS3 Owner's Handbook Manual page 200

Removing the cartridge
Stow the black pipe.
Detach the angled base from the white pipe.
Support the compressor vertically.
Unscrew the cartridge from the bottom.
Beware of discharges of fluid.
The expiry date of the fluid is indicated
on the cartridge.
The sealant cartridge is designed for
single use; even if only partly used, it
must be replaced.
After use, do not discard the cartridge
into the environment, take it to an
authorised waste disposal site or a
CITROËN dealer.
Do not forget to obtain a new sealant
cartridge, available from CITROËN
dealers or from a qualified workshop.