Bring bottled clam juice and potatoes to boil in a large pot over high heat.
24 ounces Clam juice, 1 pound Russet potatoes
Reduce heat to medium-low; cover and simmer until potatoes are tender, about 10 minutes. Remove from heat.
In a fresh, large, heavy stockpot, melt butter over medium heat.
2 tablespoons Butter
Add bacon and cook until bacon begins to brown, about 8 minutes.
3 slices Bacon
Add onions, celery, garlic, and bay leaf and sauté until vegetables soften, about 6 minutes.
2 cups Onions, 2 stalks Celery with leaves, 2 cloves Garlic, 1 Bay leaf
Stir in flour and cook for 2 minutes (do not allow flour to brown).
1/4 cup All-purpose flour
Gradually whisk in reserved juices from clams.
6 6.5 ounce cans Chopped clams
Add potato mixture, clams, and half and half.
1 1/4 cups Half and half
Simmer chowder for 5 minutes to blend flavors, stirring frequently.
Season to taste with salt and pepper. (Can be prepared 1 day ahead. Refrigerate uncovered until cold, then cover and keep refrigerated. Bring to a simmer before serving.)