Since the bulk of the water is consumed at the condensor cooling plant and the same is recycled into the stream, the question is whether what is discharged in the stream can be said to be a trade effluent? Dr. Singhvi emphasised that the consent of the State Board would not be necessary under section 25(1) for the discharge of that recycled water, unless it is shown that what the appellant discharged in the stream or river was polluted water, According to Dr. Singhvi, the use of water at the condensor cooling plant merely raises the temperature of water above the tolerance limit 130 of 400 C. if the water is discharged in the river or stream before its temperature is reduced to 400 C or below, it may well be contended that within the broad meaning of the expression 'pollution ' in section 2(e), it was imperative for the appellant to obtain the previous consent of the State Board for making use of that outlet.