i wouldnt mix the two since carbon gets exhausted faster then GFO. also they both need 2 completely different flow rates. save your self the time and money and run two separate reactors which will perform better.
if you buy two reactors i also suggest using bio pellets instead of GFO. BP last 8 X's longer then gfo and in my experience works better as well since they eliminate nitrates and PO4.
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