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；
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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