Reactor`s

I need some help/input, etc. I bought the high capacity GFO and ROX carbon fro BRS. I added the 2 mixed together in my oversized GEO reactor and am having difficulty getting the flow to go through it without going to one side. I also noticed that a lot of the fine media has fallen through the bottom plate and has settled below. I have already placed the plastic mesh we are all familiar with bougth at Michael's. the small particles still fall through. I also own 2 TLF 150 phosban reactors but envision the same issue unless I use the sponges. which will also get clogged very easily and slow the flow. Any suggestions? Does anyone know of a source for a reef safe mesh screen that I could layer with the plastic mesh to get a desired result? Thoughts anyone? Thanks.