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。
Mother would accumulate the river sand into a large heap drying in the open and then riddle with a screen before selling to the building boss.
母亲需要把捞上来的河沙堆积成一个巨大的沙丘，在空气中晾晒干后，用筛子再筛一次，然后才能卖给建筑商。
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