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13 questions from this quiz
Aluminium sulfate
Sand and gravel
Kill microorganisms
Prevent tooth decay
Calcium hydroxide
Bacteria
Activated sludge process
Nitrates and phosphates
Tertiary treatment
Excess nutrients
Pb2+Pb^{2+}Pb2+, Hg2+Hg^{2+}Hg2+, Cd2+Cd^{2+}Cd2+
Precipitation
Blue baby syndrome
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