Activated carbon is electrically charged (can be compared to a magnet) and always remains active. However, it can happen that the carbon can be saturated with impurities. When saturated there is no room to absorb the impurities, both in the pores and on the surface. If the impurities are removed the carbon will function again. Regeneration is more expensive than buying fresh activated carbon, so using new activated carbon is cost effective in the domestic context.
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