[Stoves] Home-made activated charcoal?

[Kobus Venter]

Dear list,

I found this video on chemically treating backyard made charcoal 
http://youtu.be/dPabNV7TFFo into activated charcoal and it left me 
perplexed.  I thought the surface area of activated charcoal - typically 
higher than 500 m2/g, but up to 1500 m2/g right? is largely due to the 
pyrolysis temperature, again above 700 °C?  and made in a retort type 
kiln and not in a drum.  If this is true can one not make activated 
carbon from biochar?

Regards

Kobus

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