Geoff Humphrey's BrewBlog > BrewBlogs

Czech Dark Lager

Batch #:

2025-02

Batch Size:

11.00 gallons

Boil Time:

90 min

Conditioning:

Keg

Status:

On Tap

Brew Date:

January 20, 2025

Tap Date:

March 20, 2025

Statistics

OG:

1.054 13.3° P

FG:

1.014 3.6° P

Real Extract:

5.4° P

Attenuation:

72.9% Apparent
59.4% Real

Carbonation:

2.5 volumes

Color:

23.6SRM

IBU:

31.1

BU/GU:

0.58

ABV:

5.5%

ABW:

4.2%

Calories:

181 12 oz

Fermentables

Amount	Fermentable	% of Grist
14.00 pounds	Bohemian Pilsner Weyermann	57.7%
7.00 pounds	Munich II Weyermann	28.9%
2.25 pounds	Caramunich II Weyermann	9.3%
1.00 pounds	Carafa Special II Weyermann	4.1%
24.25 pounds	Total Fermentable Weight	100%

Hops

Amount	Hop	Time	Use	Form	AA
4.00 ounces	Saaz	90 minutes	First Wort	Pellet	1.7%
1.90 ounces	Magnum	60 minutes	Boil	Pellet	12.1%
3.50 ounces	Saaz	20 minutes	Boil	Pellet	1.7%
2.50 ounces	Saaz	20 minutes	Aroma	Pellet	1.7%
11.90 ounces	Total Hop Weight

Non-Fermentables

Amount	Non-Fermentable	Type	Use	Time
0.50 g	Epsom Salt (MgSO4)	Water Agent	Mash	0 minutes
8.00 ml	Lactic Acid	Water Agent	Mash	0 minutes
0.25 g	Epsom Salt (MgSO4)	Water Agent	Sparge	0 minutes
3.00 ml	Lactic Acid	Water Agent	Sparge	0 minutes

Yeasts

Name	Lab/Manufacturer	Product ID	Form
Pilsner Lager	White Labs	WLP800	Liquid

Equipment Profile Geoff's Electric Equipment

Batch Size:

11.00 gallons

Boil Volume:

13.38 gallons

Boil Time:

90 minutes

Evaporation Rate:

8.22% per hour

Hop Utilization:

80%

Trub Chiller Loss:

0.26 gallons

Mash Profile Decoction, Single - Well Modified Malts - Batch Sparge

Ideal Grain Temp:

68°F

Mash Steps

#	Name	Type	Time	Temp.
1	Low Sach Rest	Infusion	35 minutes	132° F
2	Decotion	Decoction	45 minutes	154° F

Fermentation and Aging

Primary:

14 days @ 48° F

Secondary:

3 days @ 62° F

Tertiary:

30 days @ 34° F

General Info

Start with RO water if possible or target a soft water profile (not Pilsen - that's too soft). Cold steep Carafa for 24 hours in 1 quart of water (use a grain bag). Add liquid to boil. If not using floor malted pilsner malt, use the well-modified decoction regimen (skip the protein rest and start at low saccharification temp of 132 - adjust decoction amount or step mash to target 153 full re).

Tmavé Pivo