I'm not doing it, but I've read loads about it. Let me explain... no, no, there's too much. Let me sum up. (that for the Princess Bride fans out there).
The GFO-type (rowaphos, phosban) adsorbers should last longer than carbon before needing refresh. In any case, the GFO and carbon will have different useful lives. Running both at the same time isn't a problem, except you'll wind up changing one or the other sooner than needed.
If you do want to do that, make sure there's room in the reactor for the GFO to fluidize, then add a sponge or separator, then the carbon very loose in a media bag. That way, you can yank it out without disturbing the GFO.
Most people who want a carbon reactor add a second reactor in series behind the phosphate reactore, I think. It is pretty cheap, and makes maintenance simpler.
HTH,
Matt
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