Previous research in this area has shown that, in general, above-ground drainage systems benefit from a reduction in pipe diameter to improve drain self-cleansing.
该领域过去的研究表明，一般说来，地面以上的排水系统能通过减小管道直径而受益，从而改进排水的自清理。
When installing the drain, use an inner diameter of 10 mm above the pipe, the length can not exceed 5 meters, not to bend the pipe up. (Below)
安装排水管时，要用内径10毫米以上的管子，长度不能超过5米，不要使管子向上弯。（如下图）
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