Cut ribs into serving-size pieces; rub with seasoning mixture. Place water in a 6-qt. slow cooker; add ribs. Cook, covered, on low until meat is tender, 5-6 hours.
Cooking pork spare ribs low and slow in the oven is an easy way of reproducing ... If you have the choice between baby back ribs and spare ribs, choose the latter, because the meat is moister.