I have been preparing my organic rye grain spawn using a lime steep method inspired by cue's wbs steep tek (https://www.mycotek.org/index.php?threads/wbs-steep-tek.7005/). I do things a bit differently though, so I thought I might as well share my method... First, measure the ingredients. I use 1 qt. of water for every 2 cups of grain. For this batch I am doing 20 cups of grain to make one 15 lb bulk bag, therefore I will be using 2.5 gallons of water (10 qts). For every cup of grain, measure 1/4 teaspoon of hydrated lime, I use hi-yeild brand. I also add 1/4 tsp of gypsum for every cup of grain, but this is optional. For this batch I need 5 tsps lime and 5 tsps gypsum. As an aside, I don't pre rinse my grain because the stuff I buy is already quite clean and free of dust. Heat the water to a boil. Thoroughly dissolve 1/4 tsp lime (and optional 1/4 tsp gypsum) per cup of grain in a seperate vessel of hot water and add it back to the main steep vessel. The gypsum probably won't fully dissolve, don't worry about it. Remove pot from heat source, add grain, stir gently and lid tightly. Allow the grain to steep for 30-45 mins, or until grains are translucent around the edges and split easily with a thumbnail. Strain the grain in batches, or invest in a muslin or nylon Brewer bag or a paint strainer. Don't rinse in order to maintain the heat needed for steam drying. Lay out on a towel and allow to steam dry, gently turning occasionally until kernels are dry to the touch and pass the TP test. Load up your grain into container(s) of choice, I'm using xl .5 micron mycobags. This 20 cup recipe can fill 20+ qt jars. One cool trick I found for keeping these large bags from 'sploding in the PC is to slip the bag into another bag! They both vaccum seal up nicely, and I feel more confident while handling/storing the bag between PCing and inoculation. PC for 2 hours, or however long you normally do. When doing two of these 15 lb bag in the AA, I tend to go longer, like 2 1/2 hours. Thats about it, enjoy y'all!