When u have to compare, u should compare the final products. Stupidity here is saying the filtered water in public water system is far better than bottled water, as people are not going to the place of public water filtration system and drink from there. They drink water from their tap which should be compared with bottled water. What kind of morons do this type of research. When the water from public filtration system, the impurities existing in pipe and other unknown factors by which water becomes contaminted and delivered at the pipe should be compared with bottled water. What a stupid people. Is their brain eaten by aliens?