What reactor ??

Hi guys im currently using a cheap reactor which is hard to maintain and is quite a poor design...I love to ease and look of the dual reactors like the brs one. I'm running gfo and currently have carbon in a bag which my downpipe is in. The plan is to run gfo in the first reactor and carbon in the second but have read that the flow gets reduced quickly with the dual reactor.?? I could possibly use 2 reactors but like the thought of having the dual for easier use. What do you guys think ?? Thanks.