Sort through the black-eyed peas (1 pound) removing debris or rocks. Rinse under cold water.
Add the black-eyed peas to a large heavy bottom soup pot. Pour 5 cups cold water over the peas. Cook over high heat and bring to a boil; boil for 1 minute. Remove from the heat, cover, and let peas soak for 1 hour. Drain peas in a colander; set aside. Wipe out the soup pot.
In a large skillet over medium-low heat, cook the bacon (5 slices) until crispy, 6 to 8 minutes. Transfer the bacon to a paper towel-lined plate to cool. When cool, crumble the bacon and set aside. Do not remove bacon drippings. If you don't have at least 2 tablespoons of drippings, add vegetable oil to make up the difference.
Add the Polska kielbasa (1) to the skillet and brown over medium heat; remove to a paper towel-lined plate.
Add the onions (1), carrots (2), and celery (2) and saute until the onion is translucent about 8-10 minutes. Add the collard greens (1½ cups) and garlic (3) and cook until the garlic is fragrant about 1 minute.
Add the sauteed vegetables, chicken broth (4 cups), ham hock (1), crumbled bacon, Polska kielbasa, russet potatoes (1), salt (1/2 teaspoon), pepper (1/2 teaspoon), Cajun seasoning (1/2 teaspoon), soaked black-eyed peas, and 4 cups water to the soup pot. Bring the mixture to a boil over medium-high heat. Immediately reduce the heat and simmer covered, until the peas and potatoes are tender, and the collard greens are the texture you like, 45 minutes to 1 hour.
Remove the ham hocks from the soup. When cool enough to handle, remove any meat and return to the soup pot. Discard any skin and bones.