How does a Brita filter work?




I am just wondering how a Brita work.
Is it basically chromatography?

Does the Brita filter change hard water into soft water by removing Ca or Mg ions?




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I am performing an experiment in which you wet your hands, place one on an aluminum plate and one on a copper plate, and it produces an electric current when connected to a DC micrfo ammeter. Wet hands produce more of a current than dry hands because water conducts electricity. Why does salt water work better than plain water? And why does tap water work better than distilled water? I believe both have something to do with ions but I’m not sure. Help me please!




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