I don't know about the Swiss example in detail, but I do know that phosphorous is banned in most domestic products, as it is as well in a number of American states.
We know—and I'm speaking as a scientist—that, in the lakes in the Laurentians, there is a direct link between the presence of phosphorous, eutrophication problems and the density of housing around the lakes. We must try to see what may be contributing to this situation. When you have a dwelling near a lake, what can contribute to the presence of phosphorous? It's obviously the septic facility and a host of other causes, but the phosphorous in detergents is a possible source that can easily be eliminated. Problems will take more time to solve, but it seems to me that prohibiting phosphorous, phosphates in all domestic products is a goal we could quite easily achieve and that certain American states have already achieved.