Take a look at this crazy home water purification system created by a 68-year-old retired engineer.
Above: "magnetic bottle. Plastic bottle with a magnet (I used magnets for the refrigerator). Here are removed from the water surplus of some metals."
Below: "Fig.6 Capacitance cereal saturation. Funnel neck of a plastic bottle filled with millet. Here the water is saturated with vitamins and gets incomparable flavor Russian fields."