We have made two Canal trips in France the latest during Aug/September this year. Although we love the experience, we were horrified to discover that boat effluent is being dumped in the waterway. This was not our understanding as we were told that the toilet mascerator separated solids from liquid and this was disposed of at port dumps. Unfortunately, this is not regulated and often we heard that people were told to just dump their toilet into the Canal.This is an UNESCO World Heritage site and as such, one would assume care of the Canal would be of prime importance. Obviously, we realise now the reason for the putrid water.