shotlighter said:
According to the local paper the EA have tested the water for dissolved O2, PH & Pneumonia!!??
It was OK & no damage to fishstocks etc have resulted - I can remember when the only thing that swam in this bit of the Trent were rats & used French Letters!
I think that's the case with a lot of our rivers and inland waterways nowadays. If You compare them as they are now, to how they were in the 60's, 70's and early 80's, the difference is quite clear. Trout are now back in the Thames Basin/Pool of London, even My local river, the Great Ouse has seen Eels, and Otters return, but sadly also Mink thumbsdown:, ( but they get shot on sight

). As stricter anti-pollution regulations came into force in the 80's, coupled with harsher penalties, Our rivers have cleaned up, and the wildlife has returned.
By the look of the Trent in this article, it was probably " Drain Dye ", which has to be pretty much inert to even be allowed to be used, and its pretty strong stuff as far as dilution goes,,,,,,,,,,,i.e., a little goes a hell of a long way.