当泵关闭进行维护保养或用淡水进行冲洗时，大量的水就可能通过管道回流，从而损坏泵。
When the pumps are shut down for maintenance or fresh-water flushing, massive amount of water can backflow through the pipes, damaging the pumps.
经过处理后的杂用水通过管道连接抽水马桶，以取代自来水冲洗。
The treated waste water is led through pipe to toilet to replace tap water for flushing.
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