You can download this video from SAWBO library at sawbo-animations.org/2166
चारकोल जल निस्पंदन
Charcoal Water Filtration in “Hindi” (accent from “India”)
The following animation explains the process of developing charcoal filtration systems using sand. It is a simple process that helps to remove
many, but not all, pollutants in water that can otherwise cause health
problems.