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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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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