In pipe networks "growth ring" is an important factor to cause secondary pollution, so clearing the "growth rings" will help improve water quality and the capacity of pipes carrying water.
管网中的“生长环”是造成二次污染的重要原因，清除“生长环”有利于提高供水水质和管道通水能力。
In pipe networks "growth ring" is an important factor to cause secondary pollution, so clearing the "growth rings" will help improve water quality and the capacity of pipes carrying water.
管网中的“生长环”是造成二次污染的重要原因，清除“生长环”有利于提高供水水质和管道通水能力。
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