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PostPosted: May 12th, '17, 11:36 
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Joined: Apr 16th, '12, 11:43
Posts: 1369
Location: Kooinda Bindi
Gender: Male
Are you human?: family Hominidae
Location: deep in the bush north of Perth, WA, Oz
This may be of interest to some: Kelp biochar: a potential plant substrate for freshwater aquaponics

It seems that kelp biochar works for floating raft systems but absorbs too much water for use as GB media.

In case you're wondering or have forgotten, biochar is "... a stable form of carbon produced by the pyrolysis at high temperatures (400-500°C) of forest – or agriculture-derived biomass residues in a low – or no-oxygen environment. Biochars are stable in wet environments, provide pH stability and their long-term carbon sequestration can potentially reduce the impacts of climate change."

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