Cut the spare ribs apart at every second rib so they're in managable sized pieces. Sprinkle the spare ribs generously with salt, and let them sit in a container overnight in the refrigerator. The next day, bring a large pot of water to a rolling boil, then add the pork (you may need to do this in two batches). Return the water to a boil and let cook them until there is no blood coming out (about 5-10 minutes). Use tongs to transfer the ribs to a bowl of cold water, then scrub any bits of blood or scum off of them. Give them a rinse under cold water and put them in a clean bowl. Repeat with the rest of the ribs.