I'm thinking that the diffuser company says to remove the spray bar because the in-line diffuser will impede the flow of the filter. The rep also said to keep the terminal end of the hose at the top. I always thought that it was best to keep the diffuser as deep as possible to diffuse more co2
. As far as removing the spray bar, I think it would probably be the equivalent of adding another power head. The rep also said that the canister manufacturers report the flow rate of the filter with no media in it. Not sure if this is true or not. Anyone know?