Method, system and device for liquid treatment

A system for liquid treatment, the system comprising a liquid treatment device and a plug-in module, wherein the liquid treatment device comprises a liquid treatment container containing at least one liquid treatment medium, an inlet for receiving liquid, and an outlet for the liquid and a device head adapted for detachable coupling to the liquid treatment container, wherein the device head has an inlet line detachably coupled to the inlet and an outlet line detachably coupled to the outlet of the liquid treatment container, and wherein the plug-in module is configured to be plugged into the device head of the liquid treatment device, the device head comprising:

• a processing unit;
• a memory unit communicatively connected to the processing unit;
• a sensor comprising:
• i) integrated circuits within the processing unit or ii) software, which is stored on the memory unit and executed by the processing unit for determining a parameter characterizing a liquid treatment process;
• a plug-in module interface for communicatively coupling the plug-in module to the processing unit;
• integrated circuits within the processing unit or in the form of software, which is stored on the memory unit and executed by the processing unit for identifying the plug-in module;
• integrated circuits within the processing unit or in the form of software, which is stored on the memory unit and executed by the processing unit for loading instructions from the memory unit in response to identifying the plug-in module;
• integrated circuits within the processing unit or in the form of software, which is stored on the memory unit and executed by the processing unit for sending the parameter according to the instructions via the plug-in module interface to the plug-in module;
• means for mechanically coupling the liquid treatment device to the plug-in module;
• wherein the plug-in module comprises:
• a liquid treatment device interface for communicatively coupling the plug-in module to the liquid treatment device;
• plug-in module integrated circuits within a plug-in module processing unit or in the form of software, which is stored on a plug-in module memory unit and executed by the plug-in module processing unit for identifying the plug-in module to the liquid treatment device;
• the plug-in module integrated circuits within the plug-in module processing unit or in the form of software, which is stored on the plug-in module memory unit and executed by the plug-in module processing unit for receiving a parameter characterizing the liquid treatment process from the liquid treatment device;
• the plug-in module integrated circuits within the plug-in module processing unit or in the form of software, which is stored on a plug-in module memory unit and executed by the plug-in module processing unit for functional processing of the parameter;
• and
• means for mechanically coupling the plug-in module to the liquid treatment device.