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13 cards from this deck
Harmful bacteria & high levels of nitrogen compounds
Depletes oxygen & promotes excessive algae growth
Harmful chemicals & toxic metal compounds
Fertilisers and pesticides
Nutrient pollution, algal blooms, loss of biodiversity
Remove large particles & debris
Larger solid particles settle under gravity
Solid waste that settles at the bottom
Liquid on top with dissolved pollutants
Layers of sand and gravel
Bacteria break down sludge without oxygen, produce biogas
Aerobic bacteria break down remaining organic matter
Kill bacteria, prevent disease, make water safe to drink
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