Originally Posted by Lonewolfblue
If it's the Emperor, you don't need to use both. The 2nd slot is for the basket that comes with the Emperor, which you can put media in. Or you can use 2 pads. Either way.
This is the way I used mine many years ago. The first slot is for your GAC
pad and the second slot was for a gray basket that I would put some stuff called bio beads in. They would stay in all the time. But you can put any type media in it. As LWB stated you can put a second stage of GAC
if you want. You can also use stuff to get rid of ammonia and nitrates if you want. I`m assuming you got that gray basket ,right ?