I brewed/batch sparged Jamil’s Dunkelweizen recipe (all grain), with the addition of 1lb rice hulls to the mash. When all of the wort was collected into the kettle, my SG was low by 9 points! (1.047 instead of 1.056) I checked the SG three times with the refractometer, and got the same reading. I double checked everything that I can think of. No possibility that I miss-weighed my grains. Malt mill rollers hadn’t drifted apart to lower the efficiency. This is the only time I’ve used rice hulls, and I must say that the runoff from the mash tun was swift.But, this should be a positive, not a negative, right? I’m stumped. Any thoughts?
O’Dunkelweizen
A ProMash Recipe Report
Recipe Specifics
Batch Size (Gal): 7.00 Wort Size (Gal): 7.00
Total Grain (Lbs): 12.88
Anticipated OG: 1.056 Plato: 13.74
Anticipated SRM: 12.4
Anticipated IBU: 15.3
Brewhouse Efficiency: 80 %
Wort Boil Time: 60 Minutes
Pre-Boil Amounts
Evaporation Rate: 2.00 Gallons Per Hour
Pre-Boil Wort Size: 9.00 Gal
Pre-Boil Gravity: 1.043 SG 10.80 Plato
Grain/Extract/Sugar
% Amount Name Origin Potential SRM
54.4 7.00 lbs. Wheat Malt Germany 1.039 2
23.3 3.00 lbs. Munich Malt Germany 1.037 8
15.5 2.00 lbs. Pilsener Germany 1.038 2
2.9 0.38 lbs. Crystal 40L America 1.034 40
2.9 0.38 lbs. Special B Malt Belgian 1.030 120
1.0 0.13 lbs. Carafa Special II Germany 1.030 430
Potential represented as SG per pound per gallon.
Hops
Amount Name Form Alpha IBU Boil Time
1.20 oz. Mt. Hood Pellet 4.40 15.3 60 min.
Extras
Amount Name Type Time
1.00 Lbs Rice Hulls Other 60mins(mash)
Yeast
Mash Schedule
Mash Type: Single Step
Grain Lbs: 12.88
Water Qts: 24.00 - Before Additional Infusions
Water Gal: 6.00 - Before Additional Infusions
Qts Water Per Lbs Grain: 1.86 - Before Additional Infusions
Saccharification Rest Temp : 152 Time: 60
Mash-out Rest Temp : 0 Time: 0
Sparge Temp : 0 Time: 0
Total Mash Volume Gal: 7.03 - Dough-In Infusion Only
All temperature measurements are degrees Fahrenheit.