Three Beans and Sausage

1 1/2 lbs smoked sausage cut into pieces
1 can kidney beans, rinsed and drained
1 can great northern beans, rinsed and drained
1 can black beans, rinsed and drained
1 c chopped onion
1 c water
1 can tomato sauce
2/3 c chopped celery
1 tsp chicken bouillon granules
1 tsp minced garlic
1 bay leaf
1/2 tsp pepper
1/4 tsp dried oregano
1/4 tsp dried thyme
Hot cooked rice

In slow cooker, combine first 12 ingredients. Sprinkle with oregano and thyme if desired. Cover and cook on low 4 to 4 1/2 hours. Discard bay leaf. Serve with rice.