Closed circuit for treating drinking water with UV treatment and filtering

A portable water treatment machine, comprising:

• a closed circuit water circulation system including pipes and a water container, a water pump, and a filter cartridge connected in series by the pipes, the pipes including pipe ends connected to the water container and the filter cartridge;
• a UV radiation lamp disposed for irradiating water in the circulation system;
• and an electronic control device for controlling the pump and the UV radiation lamp;
• the improvement wherein:
• the water container comprises a removable water jug having a top with an opening;
• the filter cartridge comprises a replaceable filter cartridge selectable from a plurality of filter cartridges each having respectively different internal designs and filter materials and being replaceably connectable to the pipes;
• nonreturn valves are connected at pipe ends connected to the water container and the replaceable filter cartridge for automatically opening the pipe ends when the water jug and the replaceable filter cartridge, respectively, are inserted into the machine and which close the pipe ends when the water jug and the replaceable filter cartridge, respectively, are removed from the machine;
• a water meter is connected to the pipes;
• a UV sensor is arranged in a radiation region of the UV radiation lamp;
• and
• the electronic control device includes means for regulating at least one of circulation of the water in the closed circuit system and the UV radiation lamp, the regulating being a function of at least one of (a) an amount of water circulated from a time the replaceable filter cartridge is inserted into the machine, (b) characteristic data of the replaceable filter cartridge, and (c) a measured value of the UV sensor, for obtaining an optimum utilization of the replaceable filter cartridge and of the UV radiation lamp, and for attaining a desired water quality.