I am going to start my first batch of SP soon. I have a batch of Riesling in the primary at the moment. It is about ready to be racked to the secondary. Can I rack the Rielsing and just leave the lees etc.. in the primary to start my SP, and add the ingredients according to the recipe? I was a little confused about what exactly goes into a wine slurry in the recipe. If I proceed in this manner, do I need to add any additional yeast or just the nutrient to the primary when I start it off?