We actually work throughout the entire Great Lakes basin. The sources of the phosphorus are largely from land sources. They're urban, such as waste water treatment plants, stormwater, even household fertilizers that people use, but they're also agricultural. We work throughout the basins, often through conservation authorities in Ontario.
As well as the sources coming from within the basins, some of the solutions, as you mentioned, come from within the basins. You can attenuate the phosphorus; you can stop it before it reaches the lake, by building wetlands, by naturalizing streams, or by taking other measures.