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In 1987, Orlando put 1,200 acres of constructed wetlands to work cleaning reclaimed water; the system now polishes about 5.11 billion gallons a year - The Times of India
In 1987, Orlando put 1,200 acres of constructed wetlands to work cleaning reclaimed water. Today, the system treats about 5.11 billion gallons of water each year.
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In 2010, Shanghai turned a polluted industrial brownfield into Houtan Park; its wetlands now clean up to 634,000 gallons of river water a day - The Times of India
https://timesofindia.indiatimes.com/world/rest-of-world/in-2010-shanghai-turned-a-polluted-industrial-brownfield-into-houtan-park-its-wetlands-now-clean-up-to-634000-gallons-of-river-water-a-day/articleshow/133068200.cms