[robertskmiles]

The big question for me is, can this paper be produced cheaply enough to be more effective per dollar than whatever our current best intervention for clean water is?

My totally uninformed speculation is they're in with a shot if they can get the production volume high enough. But I'd like to see the question explored.

[Gys]

I guess most water cleaning is done larger scale for better effectiveness and focus of knowledge for maintenance. The book (filters + instructions) could be used by individuals and small families.