11.   The greatest damage stems from the continued dumping of untreated wastes into the lake.

12.   Untreated waste from the first lagoon would enter the greenhouses, where duckweed would feed off nutrients in the waste, growing rapidly.

13.   Untreated human waste remains the biggest pollution threat.

14.   Xie said his agency plans to impose fines on any factory that discharges untreated waste.

15.   The factories consume vast amounts of water, which is then returned as untreated waste into the river.