1 sweet potato cleaning and powdering 2 tools for washing sweet potato powder, square white cloth together, four ropes, one more bucket or tank for holding water, and one water pipe for using water pipes. Come down, tie the white cloth to the four corners with a rope and hang it, then pour the crushed sweet potato into the white cloth. You can't pour too much at a time. Use half a big basin, two at most. Come down and pick up the hose and add water to the white cloth. There is not much water. Put a basin under the white cloth. Then shake the white cloth to make the water and broken sweet potatoes shake back and forth, and add water to the white cloth at the same time. When the sweet potatoes crushed in the white cloth are all sweet potato residues, take out the sweet potato residues and bag them for livestock. Pour the water under the white cloth into the prepared bucket or cylinder and repeat the above actions. When the barrels and cylinders are full, cover them to prevent them from falling into dirty things. When the water in the jar barrel settles to noon the next day, pour out the water in the jar barrel and the sweet potato powder will settle at the bottom of the jar barrel.