Such devices can reduce the concentration of manganese by 60% to100% depending on filter use and the characteristics of the water.
一些装置依靠过滤器的应用和水的特性，能降低60%-100%锰含量。
A down-flow biological filter is used for the groundwater iron and manganese.
以生物滤柱为反应器，对含铁、锰地下水进行处理。
One of reasons for it is that graduation of manganese sand is not rational, which leads to partial confusion of filter layer construction.
分析原因：工艺改造时所选的锰砂有部分粒径不符合要求，导致级配不合理，造成滤层结构部分混乱；
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