In addition, still ultraviolet ray fights poisonous bacterium way. The nucleic acid inside organism drew ultraviolet energy, changed the structure of oneself, destroyed the function of nucleic acid then, the energy that draws when nucleic acid reachs deadly capacity and maintained certain illuminate, can make the bacterium dies in great quantities, ultraviolet ray kills poisonous bacterium use this one principle to undertake eliminating bacterium. This kind of method uses Yu Yijiang, river, lake, pool extensively or the equipment of small-sized water supply that well water is fountainhead.
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