Plot
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.
| Writer | Edwin Rosskam |
|---|---|
| Director | Jack Delano |
| Actor | Amílcar Tirado |
| Country | Puerto Rico |
| Production | Comisión de Parques y Recreos Públicos de Puerto Rico |