Calgon water softener is used to transform hard water into soft water. This helps laundry look brighter and whiter. The original formula was found by using basic scientific principles. It was made from amorphous sodium polyphosphate. This chemical prevented the formation of mineral salts by reacting with calcium ions and other chemicals that were in the water. Calgon is used to neutralize minerals that are usually found in water. A water softener like Calgon can help extend the life of washing machines and faucets by preventing lime build-up.