PA pipes with ninute holes ate used as filter medium in the filter system. The system is of simple construction and will require minimal supervision.

本项研究的过滤系统采用PA微孔管作为过滤介质，结构简单，管理要求不高。

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A modular Marine hydraulic oil storage device comprises a storage tank, an oil filter, a cut-off valve, a hand pump and connecting pipes.

组合式船用液压油储存装置，包括储油箱、油滤器、截止阀、手摇泵、连接管。

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Simultaneously, special pipes are arranged for collecting rain water on roofs into the filter tank, so that a problem of urban water shortage can be better solved.

同时设有专用的管道将天台上的雨水收集到过滤池，从而使城镇缺水的难题得到较好的解决。

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