> The device ... could be useful in resource-limited or off-grid environments, since it works with any open water source and does not require any outside power.

> The device ... could be useful in resource-limited or off-grid environments, since it works with any open water source and does not require any outside power. Or in a country where the gov privatised the water companies and then these companies started dumping sewage in all the waterways instead of doing there jobs, like in England.