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2. It takes a long time for PVC pipes to have chloride ion precipitation, which is not suitable for running water pipes. It has poor impact resistance and is not suitable for gas pipelines. However, PVC pipes have low prices and high hardness. There are two kinds of PVC water supply pipes and drainage pipes, which are used for municipal water supply and drainage, industrial water supply and drainage, civil water supply and drainage, irrigation, vegetation watering, etc.