BIG BREW RECIPE - KOELSCH
  85 gallons post-boil

GRAIN
  153 lb Best Malz PILSNER 90.0%
   17 lb Vienna 10.0%
     Grain Bill Total  = 170 lbs.

HOPS -- 24.5 IBU Total
  7 OZ Magnum  60 min.  12.5%AA  - 60 min.

  8 OZ. Hallertauer Hersbrucker 2.8%AA - 10 min.
 
 
Mash - Single Step - 149F. Water - 100% RO
  1.9 qt/lb grain - thin mash  -- 17 qts. strike water for 5 Gal pre-boil wort **

Mash Water Adjustment - salts / acid (per 17 qts mash RO water)
  Gypsum  1.7gr
, NaCL  1.0gr,  Epsom salt  2.0gr,  Calcium Chloride 1.5gr,  Baking soda 1.5gr  : 1.5ml 88% Lactic Acid.
  RO Water Profile Estimate   : Ca 1 :  Mg 0 :  Na  8 :  Sulfate 1 :   Cl 4 :   CaC03 16 :    Alk 13 : RA 13 (per Martin Brungard)
  Final Water Profile Estimate: Ca 50 : Mg 12 : Na  55 : Sulfate 110 : Cl 88 : CaC03  0 :  Alk 0.5 : RA -43
  K
ÖLN Water Profile Target:                Mg 15 : Na  52 : Sulfate 109 : CL 86 :

ACTUAL OG 1.049 POST BOIL

Approx. 85 Gallons post-boil
% ABV dependant on yeast.
60% efficiency (more or less)

** NOTES:  mash grain/strike water-ratio based on Eric Warners book on Koelsch:
  "When mashing is carried out ....3.4-4 hectoliters per100 kg of malt is normally used."