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How can the reader tell that the water is clean? I think the present author assumes that the water that comes from the tap is good -- which is not always and everywhere true. 18:56, 23 January 2009 (UTC)Reply[reply]

Is it not a reasonable conclusion? I'd suggest that you expand it further -- how do they know that it is free from poisons, &c;? By the way, why don't you create an account? Regards, Microchip08 (talk) 18:58, 23 January 2009 (UTC)Reply[reply]