12cups oyster water (the oyster liquor plus sufficient water to make up 12 cups)
Melt the butter over medium heat in a six quart heavy saucepan, then sauté the celery and green onions until tender but not browned, stirring frequently. Gradually stir in the flour and cook five minutes longer, stirring constantly over low heat. Add the remaining ingredients and simmer for twenty minutes. Remove the pan from the heat and scoop out the bay leaves with a slotted spoon or a long fork; discard. Serve immediately. Do not reheat.