The one thing I dislike about the dual reactor is that GFO and carbon need differing flow. Even when you get it close to a median between the two, soon the carbon becomes clumped. Well I fixed it. With a chopsaw, a small socket, and $10-$15 of parts from a hardware store, you get TWO SINGLE REACTORS. I thought about this for a long time and it was easier then I could have imagined.