无孔就不用袜子啦(filter fabric). 有孔的话我多会用来防止以后沙土吸附管子堵住小孔。要雨后地干点再干啊。
回答: 你的情况用3寸无孔就可以了。除非你有积水需要在从French drain到outfall的一路上都需一些排水。小孔是来进水的。无
由 btx2012
于 2012-07-19 06:39:50
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