No, not that I know of to date.
You have to understand that, in our systems, in the turbines themselves where the main water flows, the zebra mussels aren't an issue. There's too much flow. They can't attach there. It's in these backwater systems—our fire water systems, our cooling systems, big radiators, essentially—where those are the issue. But they're still critical to the operation of the plant and none of these plants were designed with this clogging mechanism in mind.