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In the building, the cold and hot water use the galvanization steel pipe line system more than hundred years historically, the majority water quality monitor data indicated that the main reason which caused the pipe water "reddish" and "blackish" serious in the building is the steel pipe inner corrosion. In order to improve the water quality and guarantee the water quality, since 1st of June 2000the Ministry of Construction stipulated that it is forbidden to use galvanization steel pipe in the construction water supply work. It may be replaced by plastic tube, multi-layer pipe and so on. Polypropylene pipe and fittings, because of the strong corrosion resistance ability, easy to connect, moderately-priced, hard body and so on the merits, is one of most commonly used tubing. But at present polypropylene tubing sells in market can achieve hygienic and the health request, but cannot eliminate the bacterium in the water. Therefore new polypropylene pipe, which not only conform to the hygienic and health requirement but also eliminate the bacterium in the pipe system, is eagerly expected.
