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12 questions from this quiz
Harmful bacteria & nitrogen compounds
Depletes oxygen & promotes algae growth
Toxic metal compounds
Fertilisers and pesticides
Algal blooms & loss of biodiversity
Coarse filter
Sewage sludge and effluent
Layers of sand and gravel
Bacteria in the absence of oxygen
Biogas as renewable energy
Kill bacteria & make water safe to drink
Manages water resources sustainably
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