Brew Number 121

• Twøbays Full Grain Stout (Gluten Free) (Brewfather version)

Ingredients

• 3.6kg Pale Millet Malt
• 250g Pale Buckwheat Malt (doesn't look very pale!)
• 300g Chocolate Millet Malt
• 400g Dark Roast Millet
• 400g Gas Hog Rice Malt
• 100g Treacle
• 40g Fuggles hops (4.5% AA)
• 10g El Dorado hops (10% AA) - didn't have enough Fuggles.
• 20mL Beta-glucanase
• 20mL Alpha-amylase
• 20mL Glucoamylase
• 4g Yeast nutrient
• 5g Irish moss
• 2 x Safale US-05 yeast packets
• Sachet of Mangrove Jacks Liquid Finings

Used Brewzilla for mashing.

Process

• Milled millet twice to ~0.7mm.
• Milled rice twice to ~0.9mm.
• Buckwheat was hard to mill, went as wide as possible then milled with the second rice run.
• Brought 22.3L of water to 85C.
• Add malts.
• Stir on and off for 20 minutes.
• Cooled to 50C.
• Add 20mL of beta glucanase, stiring for 30 minutes.
• Add 20mL of alpha amylase and glucoamylase, set temperature to 80C for 120 minutes.
• Sparge with 5.7L water.
• Started boil with 24.8L wort, 11% brix, pH 4.75.
• Added 30g Fuggles (forgot the bag)
• After 45 minute boil add 10g Fuggles, 10g El Dorado, irish moss and nutrient.
• Boil for 15 mins more.
• Turn off heaters.
• Chill wort (chiller in wort as pump was blocked)
• Pump to fermenter (~40C) filtered through muslin bag.
• Cooled to 20C and pitch yeast.

Used enzyme dosages from GF home brewing tutorial, seem high but there are plenty of enzymes..

Ended up with 19.5L in Fermzilla.

Brew house efficiency calculated at 88.55% (25.5 ppg)

The yeast has an apparent attenuation of 81% If that is so the final gravity should be...

FG = (SG - 1000) * (1 - AA/100) + 1000 
   = ((1064 - 1000) * (1 - 88/100)) + 1000
   = 1007

Date	Measured SG	Temperature	Corrected SG	Brix	Notes
09/01/2021 16:00	1050	37.0	1054	14%
15/01/2020 09:30	1007	20.3	1007		Cold crashed

Notes

• Yeast pitched at 25C.
• Temperature set at 20C.
• Used iSpindel3.
• Spunding valve set to 20 PSI (ale should have 2.3-2.6 volumes of CO2, used 2.0 to try and stop the iSpindel leaking).
• ABV = 1.646 * RI - 2.703 * (145 - 145 / SG) - 1.794 =
• Grafana plot

Appendix

• BrixConversion
• Refractometer calculator
• BrewCalculator
• Carbonation Calculator
• HydroCorrection
• ABV measurements

-- Main.darius - 09 Jan 2021