Water purity

Household water treatment and safe storage (HWTS) interventions are proven to improve water quality and reduce diarrheal disease incidence in developing countries. Four of these proven HWTS options – chlorination, solar disinfection, ceramic filtration, and flocculation/disinfection – are widely implemented in developing countries.

I guess they screen is based on directives given by the European Commune in Europe.

The EC gets the directives maybe from the WHO, the EC just passes on the directives (without checking the what, why and how) to the countries with 'gentle pressure' to execute accordingly (if compliance, you get some budget, if you don't follow the directive, tough luck ..), then the countries impose these directives on the municipals, again not checking what needs to be checked, why and how..