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.
| Actor | Role |
|---|---|
 Amílcar TiradoNarrator | Narrator |
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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.
| Actor | Role |
|---|---|
| Amílcar TiradoNarrator | Narrator |