I made 15 bean soup. And it's perfect! but unfortunately my sister end up putting more salt. Now the freaking soup is salty as heck!!!!
Try putting a potato cut in half in it and let it sit for a while. Seems I heard about theat trick years ago, but never used it.
send your sister to her room. add a bunch of water to the soup. add more beans!!! (15 beans are not near enough)...;-)
Once you add something like that and stire..not much you can do. add water... opposite of salty is sweet. Should have used turkey baster to suck as much out as possible