Unrecognizable ecologist standing where sewage waste water meets the river and taking samples to determine level of contamination and pollution

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• dirty water
• test tube
• pollution
• nature water
• environment
• environmental pollution
• wastewater
• eco
• experiment
• environmental protection
• infection
• bacteria
• rio
• river water
• biotechnology
• disease
• natural
• biological
• gloves
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• research
• ppe
• scientific
• control
• toxic
• 19+