Szukana fraza: [Abstract = It has been shown that one year after modernization of the technological line there was a high reduction degree of most parameters, respectively for the general iron content\-99%, general manganese\-93% ammonia\-93%, turbidity \-94%. It has been proved, that chalcedonic turned out to be better filter material than quartz sand previously used till 2008. The studies have confirmed that the stage of modernization was soon followed by bed start\-up for removing general iron from the groundwater. The stage of manganese removal required more time, about eight months for bed start\-up. Furthermore, the technological modernization contributed to the improvement of the efficiency of the nitrification process.]

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