A drop of water is taken to a laboratory in San Juan, Puerto Rico to determine its purity. The film communicates scientific health information, such as the need to boil drinking water.
DirectorJack Delano
WriterEdwin Rosskam
Directing
7.0
Movie
1971
6.4
2017
6.2
2013
2002
7.2
2022
7.4
2020
7.3
2024
2016
8.3
7.8
2007
6.9
2003
