A biosandfilter [1] is not hard to design and build and removes the most common contaminants. Acid rain does not directly affect human health. [2] [1] https://

A biosandfilter [1] is not hard to design and build and removes the most common contaminants. Acid rain does not directly affect human health. [2] [1] https://en.m.wikipedia.org/wiki/Biosand_filter https://en.m.wikipedia.org/wiki/Biosand_filter [2] https://en.m.wikipedia.org/wiki/Acid_rain#Human_health_effects https://en.m.wikipedia.org/wiki/Acid_rain#Human_health_effec...