Hello, I have a problem when cooking dried beans. I soak my beans for at least 24 hours. Whenever I cook my beans there always seems to be a small portion that still remains crunchy. I cook them just before they go mush and make sure I submerge them in more than enough water, same result. This happens whether I pressure cook or on the stove in a pot. What I do notice though is if I soak them in SALTY water (rinse off before cooking), this problem no longer arises. Does anyone know what the salty water does to the beans and has anyone else had this same problem happen to them?