We have a package of information that we provide to customers. A lot of times we have customers who have a lead service line and for various reasons are not able to act, so it's exactly that.
As Dr. Edwards said, we have point-of-use filters that we give out as temporary measures, and we also give out instructions to homeowners on how to flush their taps so that they're not using water that has been sitting in pipes for a long time. At best, they're temporary measures. We're relying on customers to maintain filters and replace cartridges. With time, their vigilance goes away. Also, with regard to flushing the taps, people get enthusiastic about doing that for a few weeks or months, but with time they lose diligence for that.