Bean Soup for 1 quart Crock Pot

2/3 cup dry Great Northern beans
2 1/2 cups water
1/4 cup chopped cooked ham (optional)
1/8 teaspoon salt
1/8 teaspoon pepper
2 Tablespoons chopped celery leaves
1/2 cup chopped sweet onion

Put all ingredients in 1 quart Crock Pot. Cover and cook 10 hours.