daveroconn
You haven’t lived in this house for long maybe? Look closely around the home and you may find an existing bypass this may have been removed. It would look like a pipe comes out of a wall and then just return back maybe painted over. If an old softener was installed in this house they would have had to tie into the existing copper and run around the house to a location that would best suite the water softener. It’s possible your home may have had a softener installed before. Good luck
Respectfully David
