Uses: widely used in industry and construction, filtersand, 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。
2
A filtersand 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。
3
Rainwater is channelled into sand catchments, which serve both to filter it and to protect it from evaporation.