uses charcoal in like a mesh filter to make water clearer
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put this mixture in water. salt will dissolve in water. now filter this solution with a filter paper. we will get particles of charcoal on the filter paper as residue. now heat the solution of salt and water .the water will evaporate leaving behind salt. thus the mixture of charcoal and salt is separated.
the sand and gravel provide physical filtering of the water, and remove large particles. The Charcoal has very small pores, and a large surface area. it removes smaller particles and absorbs some chemicals and odors.
There is an uncountable number of carbon atoms involved in charcoal; charcoal is mostly carbon.
it is the charcoal made from fractional dirtillation of blood.....and it is a very activated charcoal.
Carbon is common in both diamond and charcoal.