1. In a 6 qt multipot steam the shrimp and scallops.
2. Keep 6 cups of the water and discard the rest.
3. Chop the seafood in a food processor.
4. Set aside.
5. Heat the pot over medium heat.
6. Saute the onion, celery and garlic in the olive oil.
7. Add the soup, potatoes, thyme, rosemary, black pepper, celery salt, red pepper flakes seafood seasoning, horseradish and water from steaming.
8. Bring to a boil then reduce heat to simmer.
9. Add seafood.
10. Mix the heavy whipping cream and the flour.
11. Add to the chowder.
12. Simmer until potatoes are tender.