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Table 2

Water quality parameters studied, along with their international drinking water guidelines (taken from the World Health Organization drinking water guidelines)

Water quality parameterUnitsInternational guideline
Aluminium (Al) mg/L 0.1 
Zinc (Zn) mg/L 
pH pH units 6.5–8 
Conductivity μS cm–1 2500 at (20 °C)a 
Total dissolved solids (TDS) g/L 0.6 
Nitrates mg/L 50 
Phosphates mg/L N/A 
Turbidity FTU 
Water quality parameterUnitsInternational guideline
Aluminium (Al) mg/L 0.1 
Zinc (Zn) mg/L 
pH pH units 6.5–8 
Conductivity μS cm–1 2500 at (20 °C)a 
Total dissolved solids (TDS) g/L 0.6 
Nitrates mg/L 50 
Phosphates mg/L N/A 
Turbidity FTU 

aValue taken from the European Union Drinking Water Directive as parameter not included in the WHO guidelines. Adapted from Rickwood & Carr (2009, p. 76).

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