It has been found that main pollutants in filtering material are oil, sulfide and etc.
通过分析发现滤料污染物主要成分为原油、硫化物等。
Said invention can effectively lower filtering resistance and reduce wear of filtering material.
本发 明可有效地降低过滤阻力及减轻滤料磨损。
Coarse and uniform sand, as filtering material, could prevent filtering material loss and agglomeration.
粒径较粗且均匀的河沙滤料的使用，避免了滤料的大量流失和滤料结块。
Coarse and uniform sand, as filtering material, could prevent filtering material loss and agglomeration.
粒径较粗且均匀的河沙滤料的使用，避免了滤料的大量流失和滤料结块。
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