I have to install a new fence post to replace the rotted old one,
and am looking for advice on how to remove or break up the concrete holding the existing post.

My hope that that it can be dug out, or broken up so I can just re-fill the empty hole and set a new
PT 4x4 to support the gate.

I was told that the new post should be at least 4' down, and surrounded by 1' of concrete.

All advice is appreciated.