Yes. What has worked well is throwing money at improving the technologies used at the sewage treatment plants.
Throwing money at stormwater management has also worked well. Stormwater is about 30% of the phosphorus load. As some of you may be aware, it turns out that technology doesn't save us from all of the harms. Actually, some of the methods that we think are going to work end up not working that well in a few decades, and that's the case with stormwater management ponds.
Some of them have become a source of phosphorus pollution because of the type of anaerobic digestion that happens and the fact that we have a lot of salt. We need to manage salts—