Need help figuring out the issue with my dual reactor

I bought a dual media reactor a few weeks ago. Put the gfo and carbon in and flushed it all seemed well. Moved to to my sump got it going. It appeared all was still well. Then I noticed I was still cleaning my glass every few days. Figured it was older gfo (unused but older). Well I ordered new and swapped it out. Grabbed a jug to flush it through. Nothing is coming out the tube. I pulled the maxi jet and tested it in a bucket of water. It works great no issue. The chamber for the gfo did fill. But the gfo does not tumble and there is no water coming from the external tube. So there is an issue some where inside the reactor. Any ideas on what the issue could be?

 

Here is what I have figure out. There is a valve but it is not the issue. I removed the inner canisters to check to see if the water will flow through and it worked just fine. So it has to be something I'm doing wrong with the internal canisters which hold the media. Gfo canister is just under half full. So plenty of tumble space. Carbon is about half full and is pushed up to the top. I have watched the brs YouTube video a million times. I'm not sure what I'm doing wrong. I'm going to try and take more gfo out.

 

Thanks guys. Some of the other members helped as well and we got it figured out. Gfo clogged the carbon so they was no output. Got it cleaned up and runs better then before. Thanks everyone for the suggestions. Hopefully my tank will be back on track very soon!