Experimental studies showed that a dosage of 0,75mg/l as MnO4- is required for effective oxidation of iron and manganese in a groundwater. The permanganate is obtained and dosed as a 80% KMnO4 solution with a specific gravity of 1,76 g/ml. Determine the dosage rate (ml/min of 75% KMnO4) for a plant with a flow of 25 Ml/day.