City water purification. Wastewater flows through large circular tanks with power-driven scrapers. View from above

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• waste water
• pollution
• industrial plant
• sewer
• waste
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• dirty water
• recycle
• facilities
• clean environment
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• ecosystem
• clean water
• eco system
• aerial
• circular
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• storage
• construction industry
• construction
• hd
• round
• water
• system
• liquid
• circle technology
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