Water Lost in Spent Grains

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While calculating the overall water necessary to conduct a  full mash , batch sparge  and boil it is important to note how much water will be lost in the spent grains.  I use the basic equations below when calculating the amount of water necessary when brewing an all grain beer.


Amount of Water for Mash = (Pounds of Grain) x 1.25 quarts/pound (divide by 4 to get gallons)

Amount of Water to Batch Sparge with = (Final Boil Volume) + (Shrinkage/Evaporation) + (Equipment Losses) + (Spent Grains) – (Amount of Water for Mash)

From what I have experienced on my brewing rig spent grains absorb about 20% of there own weight in gallons, here is a chart that can be used for reference.  This estimate is based on my single infusion mash with batch sparge  in a 60 quart cooler with a grain crush around .039.

Total Grain Weight in Pounds x .20 = Approximate Gallons of Water Absorbed by the Grains

 

Pounds of Grains Gallons of Water Lost
5 1.00
6 1.20
7 1.40
8 1.60
9 1.80
10 2.00
11 2.20
12 2.40
13 2.60
14 2.80
15 3.00
16 3.20
17 3.40
18 3.60
19 3.80
20 4.00
21 4.20
22 4.40
23 4.60
24 4.80
25 5.00
mashing in a cooler

mashing in a cooler


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  1. […] Gallons (accounts for trub loss) Shrinkage/Evaporation (~.5 gallons) Equipment Losses (~1 gallon) Water Lost in Spent Grains (link describes how to calculate) Amount of Water for Mash (1.25-1.5 x pounds of grains used) […]



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