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2. Activated charcoal is the most porous material known. Although this is not the way activated charcoals are made, you may still end up with some very porous charcoal, may be much better then Perlite to help retain moisture.
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The charcoal might be porous, but it will also adsorb a whole lotta stuff and this stuff won't be available to the plant roots. 
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--Ruth
Some say the glass half-full. Others say the glass is half-empty. To an engineer, it’s twice as big as it needs to be.
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