求翻译：11. Backflush each valve (one at a time) by opening manifold valve and allowing water to flow for ~ 5 minutes until all zones have been flushed.是什么意思？

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11. Backflush each valve (one at a time) by opening manifold valve and allowing water to flow for ~ 5 minutes until all zones have been flushed.

问题补充：

匿名	2013-05-23 12:26:38 11.反冲洗（一次）的打开的流形阀，并允许每个阀水流向的 ~ 5 分钟，直到所有区域已经被都刷新。

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