The filter cartridge is part number SIMPAKKD2, and the final bacterial filter (the bell-shaped filter at the outlet point) is part number MPGP02001. Always replace these at the same time.
For servicing, contact our Millipore rep Ray Reilly, 800-645-5476 ext. 6795, raymond_reilly@millipore.com. The SIMPAKKD2 cartridges are specifically for a system with input water that has already been partially purified by reverse osmosis (“RO water”). Our water purifier is a Millipore “Synergy” system (part # SYNS60001).