BRS easy to use its a house filter with a little modification.
Dont get the duo if your going to run 2 different medias then just get 2, because if you put carbon in 1 its flow rate lowers then so will your GFO.
I understand what you are saying, but I do have a question for you.
Since the carbon needs strong flow, wouldn't putting the carbon first work to lower the flow to the gfo which needs lower flow anyway?



