NEW TUTORIAL - How to make a biosand filter ?
Z
ZT Purt Channel
1 Views • Mar 07, 2023
Description
Despite the earth's abundance, only 2.5% of the world's water is freshwater, drinkable. According to WHO/UNICEF 2020, more than half of the world's population, or 4.2 billion people, lacks safely managed sanitation services. This causes, again according to these sources, many problems of malnutrition.
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