I know Manitoba Hydro is using it now or is exploring it. I don't know how efficient it is. OPG has used a dead bacteria called Zequanox that's only toxic to dreissenid mussels. They eat it and then die. That's one good way to do it. We also use UV systems as well in our piping, but that's a broad-scale biocide. That kills everything that goes through it.
On May 6th, 2019. See this statement in context.