Modeling an SBR with only 2 outputs

Hello! I'm currently working on a project where the SBR's only have 2 outputs, one effluent water, the other recirculating the solids back to another reactor.
The SBR model in West (2016) however has out_1 and out_3 for water. What would be the best way to model my SBR?

Can I simply leave one of the terminals with no connections (if so, which one should I use?)
Or should I used a 2-combiner to connect the outputs?

Thanks for the help!

Hi,
actually the SBR model has got 3 'flow' outputs (and 1 'data' output): you can use the 'F1' key when the block is selected on the layout to access the model description (see image).
It's essentially up to you to make sure that the by-pass (terminal 'out_3') is nil at all times.
Then you will have an effluent flow ('out_1') and a sludge withdrawal ('out_4'): whether you want / need to graphically connect these terminals to other terminals, is entirely up to you, not necessary.

I don't understand why you would use a 2-combiner though: to connect what?

Thanks for the reply, I was using the combiner to combine the out_1 and out_3 because I hadn't understood what they were. Thanks for the help!