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In the traditional way of filtration we use 3 pots with charcoal at the top most pot, gravel at the second pot and sand at the third pot. but in place of charcoal and gravel if we use sand will iit be a better idea?why? |
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Answer» In the traditional way of filtration we use 3 pots with charcoal at the top most pot, gravel at the second pot and sand at the third pot. but in place of charcoal and gravel if we use sand will iit be a better idea?why? |
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