Alpha Amylase 68 - 70C (Producing Sweet & Malty)
Beta Amylase 60 - 65C (Producing Dry & Crisp)
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Belgian Witbier Quick Steps.
Mash 5Kgs grain with 12.5L water at 68-69C. Collect 7.1L wort with OG at 1.08.
Lager Steps
Preheat the mash tun with 100C boil water.
Mash all at 67C for 90 minutes. Squeeze hard to get all the wort out.
Collect total wort of 21.6L with OG 1.040 at 55.5C. Equal to OG 1.051 @ 20C. Efficiency is 80%.
Add up to 24.5L and boil to 23.5L.
Final 16L only get into fermentation barrel. Use (10g + 7g ) 17g bohemian lager yeast M84 from Mangrove Jacks.
Rehydrate at 24C, cold down to 20C and add into wort (20C). Quickly cold down the fermentation barrel to 12C within 5 hours.
M84 Lager yeast starts really slow. After 36 hours only sees some thin krausen on top. No bubble at airlock yet.
Bubble activity is slow compare with ale yeast.
Primary Ferment at 12C - 12 days
13rd day - 14C
14th day - 18C
15th day - Stir the fermentor to gather the yeast in center.
15th - 24th day - 18C
17th day sample - 1.016 Gravity at 20C.
25th Day - 18C
26th Day - 14C
27th Day - 10C
28th Day - 6C
29th Day - 2C
30th - 34th Day - 2C
35th Day - Add yeast and bottle.
After bottle keep at 20C for 2 weeks. Then keep at 2C for 4 weeks.
Set CO2 volume to 2.4, 15.3L, 12 Celsius, use 78.5g table sugar.