It was a major concern with the use of “deleterious substances”, in DFO language. Chlorine is toxic to the aquatic environment, so that's a deleterious substance. OPG had been treating for zebra mussels into the nineties. We had provincial permits to use chlorine to maintain our stations, as did municipal water intakes and other industrial users. There was a lack of alignment between the federal government and the province about the use of a biocide to control these species. In 2016, we got sign-off from DFO that it would be allowed. We want to make sure that isn't lost. We don't want to use chlorine in the environment—
On May 6th, 2019. See this statement in context.