从热水器底部的排污阀排出大约5加仑的水。
Drain out 5 gallons of water from the drain valve at the bottom of the heater.
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.
生物操作配置；工作台底部配有排污接口，排风处设置高效过滤器。
Biologically operating configuration, drainage joint is in the bottom of bench, effective filter is in the vent.
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