It's not the most eficient means of running
GFO, since the media doesn't get fluidized, and the flow rate is definitely not optimal, you certainly CAN use it in the canister, and it's better tan not running it
IMO. I used to use a canister for running carbon, but switched to a second TLF phosban reactor since it's much easier to maintain, and takes up far less room than that stupid canister.