This is a Granfather based question. How do I figure out my grain absorption rate to change that rate in my equipment profile? Here is what happened last brew. Strike water Calculated with the chart given in the instructions. Total grain weight 6.40 KG. Strike water 20.75 liters. Sparge water 12.90 Liters. My return was only 24 liters after sparging was complete. SG was huge expected was 1.048 actual was 1.068. I added 4 liters top up water to have a proper boil volume. I use rice hulls and a fine crush could that be making a difference in the grain absorption rate?