Use of 2 medias in 1 reactor

[Frenchie2]

I got a TLF 150 Phosban reactor from another reefer and I wondered if I can run 2 medias i.e. GFO & carbon within the same reactor. If so, what specific quantity should I use of each in the reactor? I did not have instructions, I looked up on internet but it is not overly specific... I have a 90 gallon tank and a 40 gallon sump. I am planning to run the reactor from the sump and got a Maxijet 600 to run the reactor. I was advised to use the "Matrix Carbon" (I was only going to run carbon initially). What kind of GFO would be suggested? Also where in the sump should I put the pump and the return tube? My sump is divided in 3 compartments: A small division for refugium (nothing in it at the moment), a division where the tank pump operates and another division where the skimmer is. The reactor will hang outside the sump above water line. Your advice would be greatly appreciated. Thanks!