Brita

A liquid treatment cartridge comprises a housing. The housing comprises an axial end wall (17) at one axial end, with respect to a cartridge axis (13). The housing comprises at least one liquid inlet (22) in an exterior surface (20) of the housing at the one axial end. The housing encloses a chamber (16). The housing comprises at least one axial section pervious to liquid flowing out of the chamber (16) at a position axially removed from the one axial end of the housing. The housing comprises at least one hollow structure (18) of which at least a part protrudes into the chamber (16) with respect to the axial end wall (17). The protruding part of the hollow structure (18) provides at least one liquid outlet allowing liquid to pass from an interior (24) of the hollow structure (18) into the chamber (16). The interior (24) of the hollow structure (18) is continued by a passage (23) through the axial end wall (17), which passage (23) terminates at at least one of the at least one liquid inlets (22). The housing comprises at least one venting passage (25a-d) extending from a gas inlet (26a-d) to a gas outlet (27a-d) and through the axial end wall (17) for venting gas from the chamber (16). The gas outlet (27a-d) is a gas outlet (27a-d) formed in the exterior surface (20). The gas inlet (26a-d) is a gas inlet (26a-d) separate from the protruding part of the hollow structure (18).

A liquid treatment cartridge comprises a housing comprising a capping part (18;78;112,113) and a vessel-forming part (19;79;110), joined to each other to enclose a housing interior (20;80;111;111'). The housing comprises a laterally protruding circumferential rim (23;84;118;139). At least the vessel-forming part (19;79;110) is placeable in a cartridge-receiving chamber (11;55;66;104) of a liquid treatment system (1) such that the rim (23;84;118;139) engages a co-operating part (26;59;77) of the liquid treatment system (1) along a surface (25;141,142) of engagement of the rim (23;84;118;139) to prevent a flow of liquid through a mouth (15;57;68) of the cartridge-receiving chamber (11;55;66;104) past the housing of the liquid treatment cartridge. The surface (25;141,142) of engagement extends in a loop around an axis (21,81;114;114') of the housing extending from an axial end of the housing at which the capping part (18;78;112,113) is provided to an opposite axial end of the housing. The surface (25;141,142) of engagement encloses part of an exterior surface of the housing. The capping part (18;78;112,113) comprises at least one liquid inlet for entry of liquid into the housing interior (20;80;111;111') through the enclosed exterior surface part. The housing comprises at least one venting channel, having at least one inlet (41;95a,b;132;145) for gas through the exterior surface at the rim (23;84;139) and at least one outlet (50;96a,b;130) for gas. The at least one inlets (41;95a,b;132;145) for gas are located outside the enclosed part of the exterior surface. The at least one outlets (50;96a,b;130) for gas are separated from the enclosed part of the exterior surface by at least one of the surface (25;141,142) of engagement and the housing.

In a set of liquid treatment systems (10a-c,15a-c,20) connected in parallel to a common source (6,7,8,9) of liquid to be treated, each liquid treatment system (10a-c,15a-c,20) comprises a liquid treatment device (12a-c,17a-c,22) and an operational data processing system comprising at least an interface to an associated sensor (38) for measuring at least one parameter for, at least in combination with setting information that is information on at least one setting (x;82) of the liquid treatment system (10a-c,15a-c,20), determining a value of a concentration measure (H) that is a measure of a concentration of at least one component changeable by the liquid treatment device (12a-c,17a-c,22) in liquid flowing through the liquid treatment device (12a-c,17a-c,22). The operational data processing system is configured to carry out a process (43,45,46;58,60,61;81,83,86,87) associated with operating the liquid treatment system (10a-c,15a-c,20). A method of processing data obtained from the set of liquid treatment systems (10a-c,15a-c,20) comprises: obtaining from multiple ones of the liquid treatment systems (10a-c,15a-c,20) in the set local data (49;64;73). The local data is selected from the group consisting of: (i) a value of the concentration measure (H) determined by the operational data processing system of that liquid treatment system (10a-c,15a-c,20) on the basis of at least one value of the parameter obtained from the sensor (38) associated with the operational data processing system; and (ii) at least one value of the parameter determined by the sensor (38) associated with the operational data processing system of that liquid treatment system (10a-c,15a-c,20) and any setting information required to determine a value of the concentration measure (H) on the basis of the at least one value of the parameter. The local data (49;64;73) obtained from the multiple liquid treatment systems (10a-c,15a-c,20) is processed to determine a consensus value (54;59;79) of the concentration measure (H). At least one of the consensus value and a parameter value derived from the consensus value is provided as input to the process (43,45,46;58,60,61;81,83,86,87) performed by the operational data processing system of at least one of the liquid treatment systems (10a-c,15a-c,20) in the set.

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