Here's some info from Mayo Clinic that you may find useful. I'll keep searching for more info that may tell about the green little devils that seems to be in question, but here's what I have so far and it tells of one remedy besides surgery using bile salt tablets which I would think would have similar effects as the Epsom Salt and/or Sea Salt .
Your gallbladder is a 3- to 4-inch-long, pear-shaped sac tucked behind your liver on your right side. It serves as a reservoir for bile produced by your liver. Bile is a greenish-brown fluid that helps digest fats. After you eat, your gallbladder contracts and empties bile into your small intestine. Gallstones are made up of various components of bile. Most are made of crystallized cholesterol. These are usually white or yellow in color. About 20 percent are made mostly of bile pigment and are somewhat darker.
No matter what their size, shape or number, Gallstones fall into one of three categories:
Cholesterol stones. The most commonly occurring gallstone among Americans and Europeans, these are composed mainly of undissolved cholesterol, although most also have other components, such as calcium and bilirubin, the residue from the breakdown of red blood cells.
Pigment stones. These small, dark brown or black stones form when your bile contains too much bilirubin. It's not always clear what causes them. The destruction of red blood cells in some types of anemia also may create excess bilirubin.
Primary bile duct stones. Unlike stones that form in your gallbladder but escape into your bile ducts, these stones form in the ducts themselves. They're usually soft and brown and made of decomposed bile.
When surgery isnít the best option, your doctor may recommend one of the following treatments:
Bile salt tablets. These tablets dissolve cholesterol stones over a period of time. The treatment works best on small cholesterol stones. Many doctors prefer the medication ursodiol (Actigall) because it's one of the safest and seems to have the fewest side effects. Unfortunately, ursodiol is expensive, and its effects aren't permanent. Gallstones tend to recur within 10 years of treatment in half the people taking the drug. To prevent a recurrence, most people need to take ursodiol indefinitely