25,000m sounds like a lot (if that was the amount released) but it equates to about 15mins of the Wyes flow given the water height. Given mixing by the time it got to Letton it would have been diluted markedly.

Glad to hear it was being monitored and hopefully there is some comeback for DCWW. This event will certainly bring it up in the priority list for improvement.

Sorry to hear about the dead salmon, did you call it in? If it can be proven it was due to the pollution that also puts it up the priority list for action by EA.