prov:value
| - The target water quality objectives for the Middle Vaal catchment (DWAF, 2006) indicated that the concentrations of variables such as iron, manganese, nitrate and nitrite, orthophosphate, chloride, sodium, sulphate, faecal coliform bacteria, magnesium, aluminium, ammonia and fluoride were either ideal or acceptable, except for pH and conductivity which were unacceptable and tolerable, respectively
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