Preheat oven to 350 degrees. Lightly grease casserole dish. Place pork chops in casserole dish. Sprinkle with 1 teaspoon salt. Peel potatoes and cut into 1/2 inch thick slices. Spread over pork chops. Cut onions into 1/4 inch thick slices and spread over potatos. Sprinkle with pepper and 1/4 teaspoon salt. Blend soup and water (or milk and water); pour over potatos. Cover and bake for 1 to 1 and 1/2 hours or until done.