在上行管的底部设一清洗排污出口，用过一段时间加入清洗剂，打开 下排污口进行冲洗，一根根清洗。
The bottom of the risers is provided with a cleaning drain outlet which can be opened for washing the risers one by one by adding a cleaning agent after a period of use.
在上行管的底部设一清洗排污出口，用过一段时间加入清洗剂，打开 下排污口进行冲洗，一根根清洗。
The bottom of the risers is provided with a cleaning drain outlet which can be opened for washing the risers one by one by adding a cleaning agent after a period of use.
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