If you are using BRS's "CLEAR REFILLABLE CARTRIDGE FOR DI RESIN" (it's not really clear... opaque really) then I think you are right. I tried using one of those for my GFO reactor and got very little water flow through it. I assume the same problem for air flow.
I use the 10" BRS REACTOR REFILLABLE CARTRIDGE - HARD SHELL for my CO2 scrubber and get good air flow through it. It really is clear too, so you can better see when the media changes color.
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Aqueon 90g RR, Trigger Systems Emerald 34 sump, 2 Radion XR30w G3 PROs, Vertex Omega 150 Skimmer, MaxSpect Gyre XF130 and XF230, Sicce Syncra Silent 4.0 Return, Apex Controller, Avast ATO, BRS Media R
Current Tank Info: 90 gallon mixed reef
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