Potato Cheese Soup

5 cups chicken broth
3/4 c. chopped onion
1 tsp. salt
1 3/4 c. chopped celery
8 c. potatoes diced small
2 c. shredded carrots
3/4 c. flour
3/4 c. butter, melted
1 1/2 qt. milk
2 1/2 c. grated cheese

Combine broth, celery, onions, carrots, and salt, boil ten minutes. Add potatoes and boil another 10 minutes or until just tender. Mix together butter and flour and stir in, then add milk. After it begins to thicken add cheese. Serve with bacon bits.