Start by filling your slow cooker with your apples. Cover in sugar, cinnamon, cloves, and salt. Cook on high for 1 hour. Lower heat and continue cooking for an additional 3 to 4 hours. Run through a blender until smooth. Place back in the slow cooker and cook for the remainder of the day (total cooking time about 9 hours). In the evening fill mason jars and seal. Keep in mind it will thicken as it cools. It will keep safely about two weeks in the refrigerator.