Liquid treatment apparatus and liquid treatment cartridge

A liquid treatment cartridge comprising:

• a connecting head having at least one port in liquid communication with an interior of the liquid treatment cartridge,
• wherein the connecting head is insertable into a receiving part of a main part of a liquid treatment apparatus such that the at least one port of the connecting head is in sealed liquid communication with a corresponding at least one port of the receiving part,
• wherein the connecting head of the liquid treatment cartridge is insertable into and retractable from a cavity of the receiving part in a first position,
• wherein the liquid treatment cartridge comprises a cartridge axis, aligned with a direction of insertion when the connecting head is inserted in the cavity,
• wherein the connecting head comprises at least one laterally protruding alignment part of each of at least one set of alignment parts for axially aligning the cartridge axis of the connecting head with an axis of the receiving part corresponding to the direction of insertion, each of at least one set further comprising a groove of the receiving part, and
• wherein the at least one laterally protruding part of each of the at least one set of alignment parts inserts into the groove of the receiving part from each of the at least one set of alignment parts when the connecting head is inserted into the cavity.

A method of attaching a replaceable liquid treatment cartridge to a head part of a liquid treatment apparatus,

• the head part including at least one device including:
• a main part;
• and
• a receiving part including at least one cavity,
• the replaceable liquid treatment cartridge including a connecting head having at least one port in liquid communication with an interior of the replaceable liquid treatment cartridge, the method including:
• inserting the connecting head into the cavity such that the at least one port of the connecting head is in sealed liquid communication with a corresponding at least one port of the receiving part,
• wherein the connecting head is inserted in a first position of the receiving part with respect to the main part,
• moving the receiving part with the inserted connecting head into a second position with respect to the main part by at least swivelling the replaceable liquid treatment cartridge, and
• wherein the receiving part is moved into the second position by also displacing the receiving part relative to the main part.