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It depends on several factors
1. Water quality. If the water containe organic impurities after a while comes equilibrium sorption-desorption and most of the impurities will be absorbed by carbon. Inorganic impurities (salts, acids, alkalis) usually are not practically sorbed.
2. A method for manufacturing of activated carbon. If the granules obtained by pressing powder activated carbon, after a while they collapse and at the bottom of the vessel will be powdered coal.
3. The residence time of coal in the vessel. Prolonged storage of coal in the vessel with water possible proliferation of pathogenic bacteria.