Originally Posted by Greg83
Hello everyone. I know it's very early to be brewing this gem but pumking is one of my favorite beers. This will be my very first all grain brew and I want to get it right before october rolls around. I know I wont be able to find pumpkins so I will use puree. I had a quick question with the recipe on page 20. I was wondering how much water I start out with in the mash and how much to add when sparging. With all grain do you still add the 2 gallons of cold water at the end into the primary like you do with extracts?
Thanks for any help in advance!
For mash water, pick a mash thickness between 1.0 quarts/lb and 2.0 quarts/lb. I usually do 1.25 quarts/lb.
Then take your total grain weight and multiply by mash thickness. That's the volume of mash water you need.
For sparge water, calculate grain absorption with 0.125 quarts/lb of grain weight. This is how much water the grain will "drink." Subtract this from your mash water and the result should be what you can expect from your first runnings.
Subtract first runnings volume from your desired pre-boil volume and you've got your sparge volume.
This is calculating a full boil, so no, you don't add water to primary like with extract. At the end of the boil you should have your full volume.