Uses: widely used in industry and construction, filter sand, filter liquid and gas.

用途：广泛用于工业及建筑业，筛选砂粒，过滤液体及气体。

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A filter sand riddle is installed in the head desanding tube and in each desanding tube in the middle, and a magnet is installed in the end desanding tube.

首节及中间各节除砂管内装有滤砂筛，末节除管内装有磁铁。

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Rainwater is channelled into sand catchments, which serve both to filter it and to protect it from evaporation.

雨水被导入沙砾储水区，这样有两个好处，一是能够过滤雨水，二是能够减少水的蒸发量。

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The filter consists of iron filings, cut in small pieces, and sand.

CNN: Filter cleans arsenic-tainted water

In early 1998, as more bombs were found, and after an abortive attempt to filter out the ammunition, the navy abandoned the beach-replenishment project, dumping the sand into the sea instead.

ECONOMIST: California��s beaches: Out to sea | The