I am not sure there is such a thing as a green label swim, I know the swim 16 all are green label even if they don't have an actual green label. Can't recall on the swim lnbs. A bsf can't hurt the system in this case, so you can put one on where the cable connects to the first splitter front he dish if you'd like. No need to replace the lnb, I would not touch it if its got a good signal.
SWM LNB are in fact "green label" before DECA they were "white" label. the "green" label denotes compatibility with DECA. if your LNB is not green label, a BSF filter is required
Here’s to the crazy ones.
The misfits. The rebels.
The the troublemakers.
The round pegs in the square holes.
The ones who see things different.
They’re not fond of rules, and they have no respect for the status quo.