I have my main panel grounded through two ground rods buried underground outside my house. When I put in my submersible well pump the other day, I had a lug welded onto the outside of the well casing (steel, 100 feet into bedrock)below ground and ran a ground wire from the well casing into the house. As I understand it, the well casing is a better ground than the two rods I currently have. I am wondering if it would be a good idea to disconnect the present ground wire and change over to the one coming from the well casing. Or, would it be ok to connect both at the ground connection at the panel?