[Elecraft] K3S filter for FT8?

[Frank O'Donnell]

I'm sure this is a well-covered question, but I'm getting so many hits 
on search terms that it's difficult to find past discussions.

On the K3S or K3, what filter(s) are people finding optimal for FT8? Due 
to its popularity, it seems as though the FT8 bandwidth has been 
gradually widening.

Thanks and 73,

Frank O'Donnell K6FOD