Yes and no. For example. Boyd's Chemipure Elite has both GFO and carbon but it is in the mesh bag so the GFO never churns.
You can but you will not get maximum effeciency from the GFO. GFO should be slightly churning or boiling. GFO is much harder than carbon. If your GFO is churning/boiling then it will grind the carbon to dust.
|