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Salt tide threatens water quality in Pudong’s rivers

A salt tide has been affecting Shanghai for the first time this year, threatening water quality in rivers and reservoirs in the Pudong New Area at the mouth of the Yangtze River, officials said today.

The chloride density has surged to more than 900 microgram per milliliter in the river near Pudong's Sanjiagang Port Reservoir. Tap water requires a chloride density of 250 micrograms or less.

The reservoir has stopped its intake of water from the river and the water authority has added fresh water into the affected rivers to reduce salt densities.

Salt water pours into the mouth of the Yangtze River from October to April.

The Qingcaosha Reservoir can supply the city with water for up to 68 days while the Chenhang Reservoir has a 10-day supply of water.



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