When I saw the thread title I thought it was about plumbing for couples who were inseparable. On the other hand, if it's about helping communities to improve their sanitation, then I give it 👍
Even in India, which is a nuclear super power, just about everyone has a mobile phone, yet only about 50% of the population has access to a flush toilet. Though you might think that such a nation might be better sorting out sanitation before buying nuclear weapons.
However, for other, poorer nations, I still think the notion is sound. The main improvement for global health that has occurred in the last 100 years has been due to access to clean water, and this is a move in this direction.