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Guide to homebrewing beer including equipment setup, extract and all-grain methods, recipe design, sanitation, fermentation management, packaging, style guidelines, troubleshooting, and water chemistry.
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SKILL.md
391 lines · 2,762 words
Gather requirements. Ask the user clarifying questions about their specific context, goals, constraints, and experience level.
Analyze the situation. Review the information provided and identify key factors, challenges, and opportunities relevant to homebrewing.
Guide to homebrewing beer including equipment setup, extract and all-grain methods, recipe design, sanitation, fermentation management, packaging, style guidelines, troubleshooting, and water chemistry.
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What it covers
When to Use
Process
Questions to Ask First
Equipment Setup
Extract Brewing (Start Here)
All-Grain Brewing
Recipe Design
Sanitation
Fermentation Management
Bottling and Kegging
Style Guidelines (BJCP Categories)
Troubleshooting Off-Flavors
Water Chemistry Basics
Safety Considerations
Progression Path
Resources
Output Format
Example
Develop the framework. Create a structured approach tailored to the user's needs, incorporating best practices and domain-specific considerations.
Deliver actionable output. Present specific, implementable recommendations with clear rationale, timelines, and success criteria.
Address edge cases. Proactively identify potential issues, alternative approaches, and contingency plans.
Use this skill when:
User needs guidance on homebrewing
User asks about homebrewing best practices or techniques
User wants a structured approach to homebrewing
Do NOT use this skill when:
A more specialized skill exists for the specific subtopic
The request is outside the scope of homebrewing
Before recommending an approach:
Have you brewed beer before? (Never / Kit beer / Extract / All-grain)
What beers do you enjoy drinking? (Styles, brands)
What is your budget for equipment? ($75-150 / $150-300 / $300-600 / $600+)
How much space do you have? (Apartment kitchen / Garage / Dedicated brew space)
How much time can you spend on a brew day? (2 hours / 4 hours / 6+ hours)
Do you want to bottle or keg your beer?
What volume do you want to brew? (1 gallon / 5 gallons / 10+ gallons)
Are you interested in other fermented beverages? (Cider, mead, wine, kombucha)
Do you have temperature control capability? (Consistent room temp / Fermentation chamber)
Are there local homebrew shops near you?
Essential Equipment:
Brew kettle: 5+ gallon stainless steel or aluminum pot ($30-60)
Fermenter: 6.5 gallon bucket with lid, grommet, and airlock ($15-20)
Airlock and stopper ($3-5)
Auto-siphon and tubing ($12-15)
Hydrometer ($8-10) - measures sugar content/alcohol potential
Thermometer ($8-15)
Sanitizer: Star San ($10) - the gold standard, no-rinse sanitizer
Bottling bucket with spigot ($15)
Bottle capper and caps ($20)
Bottles: Save and clean commercial pry-off bottles (free) or buy new ($15-25/case)
Large spoon (stainless or food-grade plastic)
Mash tun: Insulated cooler with false bottom or manifold ($50-100)
Hot liquor tank: Second large pot for heating water ($30-60)
Wort chiller: Immersion copper coil ($50-80) - rapidly cools wort
Better kettle: 8-10 gallon with ball valve ($80-150)
Grain mill: Crush your own grain for freshness ($80-150)
Refractometer: Quick sugar readings during brew ($25-35)
Cornelius (Corny) kegs: 5 gallon, used ($30-60 each)
CO2 tank: 5 lb aluminum ($60-80)
CO2 regulator: ($40-60)
Beer line and faucet/tap ($20-40)
Kegerator or keezer (chest freezer conversion): ($150-400)
Fermentation temperature control: Chest freezer with Inkbird controller ($120-180)
Conical fermenter (optional luxury): ($100-500)
Malt extract (liquid or dry) is concentrated wort that someone else has mashed. You rehydrate it, boil with hops, ferment, and package. Produces excellent beer with less equipment and time.
Step 1: Prepare (15 minutes)
Gather all ingredients and sanitize all equipment that touches cooled wort
Read recipe completely before starting
Step 2: Steep Specialty Grains (20 minutes)
Heat 2.5 gallons water to 155-165F
Place crushed specialty grains in mesh bag, steep for 20 minutes
Remove bag, let drip (do not squeeze)
Step 3: Bring to Boil and Add Extract (10 minutes)
Remove pot from heat
Stir in malt extract (prevents scorching on bottom)
Return to heat, bring to rolling boil
Watch for boil-over (the foam surge when it first boils - reduce heat immediately)
Step 4: The Boil (60 minutes)
Add hops according to schedule:
60-minute hops: Bitterness
15-minute hops: Flavor
5-minute or flameout hops: Aroma
Add other ingredients as recipe specifies (Irish moss at 15 min for clarity)
Step 5: Cool the Wort (20-30 minutes)
Cool to under 70F as quickly as possible (ice bath or wort chiller)
Fast cooling reduces contamination risk and produces clearer beer
Ice bath: Fill sink/tub with ice and cold water, stir wort occasionally
Step 6: Transfer to Fermenter (10 minutes)
Pour cooled wort into sanitized fermenter
Top off with cold water to 5 gallons
Splash and stir vigorously (aerate - yeast needs oxygen to start)
Take hydrometer reading (Original Gravity - OG)
Step 7: Pitch Yeast (5 minutes)
Sprinkle dry yeast on surface or pour prepared liquid yeast
Seal fermenter, attach airlock filled with sanitizer or vodka
Step 8: Fermentation (1-2 weeks)
Place in consistent temperature location (65-72F for ales, 48-55F for lagers)
Airlock should begin bubbling within 24-48 hours
Do not open fermenter during active fermentation
Primary fermentation: 7-14 days
Take final gravity (FG) reading to confirm fermentation is complete
ABV = (OG - FG) x 131.25
Step 9: Bottling (1-2 hours)
Boil 3/4 cup corn sugar (priming sugar) in 2 cups water, cool
Add to bottling bucket, siphon beer on top (mix gently)
Fill bottles to 1 inch from top, cap
Store at room temperature 2-3 weeks for carbonation
Refrigerate and enjoy
Complete control over ingredients and process
Lower ingredient cost per batch
Access to any grain bill (not limited by available extracts)
Deeper understanding of the brewing process
More creative freedom
Mashing (60 minutes)
Heat strike water to ~165F (10-12 quarts per 10 lbs grain for typical infusion mash)
Add crushed grain to mash tun, stir in strike water
Target mash temperature: 148-156F
Lower temp (148-150F): More fermentable, drier, lighter body
Higher temp (154-156F): Less fermentable, sweeter, fuller body
Hold for 60 minutes (insulated cooler maintains temperature)
Mash out: Raise to 168F to stop enzyme activity (optional but helpful)
Lautering/Sparging (30-45 minutes)
Recirculate (vorlauf): Draw wort from bottom, pour gently back on top until clear
Begin draining wort into brew kettle
Sparge: Rinse grains with 168-170F water to extract remaining sugars
Batch sparge (simpler): Add all sparge water at once, stir, drain
Fly sparge (more efficient): Slowly sprinkle water over grain bed as wort drains
The rest of the process (boil, cool, ferment, package) is the same as extract brewing.
Water
90%+ of your beer by volume
Mineral content affects flavor, mash pH, and hop perception
Most municipal water makes acceptable beer (see water chemistry section)
Malt (Grain)
Provides sugar for fermentation, color, body, and malt flavor
Base malts (80-100% of grain bill): Pale malt, Pilsner malt, wheat malt
Specialty malts (0-20%): Crystal/caramel (sweetness, body), roasted (color, coffee/chocolate), munich/vienna (maltiness)
Hops
Provide bitterness (balance malt sweetness), flavor, and aroma
Measured in IBU (International Bitterness Units)
Bittering hops: Added early in boil (60 min), higher alpha acid varieties
Flavor hops: Added mid-boil (15-30 min)
Aroma hops: Added late (0-5 min) or dry-hopped (post-fermentation)
Popular varieties: Cascade (American citrus), Centennial (floral/citrus), Citra (tropical), Mosaic (berry/tropical), Saaz (spicy/herbal, Czech lagers)
Yeast
Converts sugar to alcohol and CO2
Produces flavor compounds (esters, phenols)
Ale yeast (Saccharomyces cerevisiae): Ferments warm (60-75F), faster (1-2 weeks), fruity esters
Lager yeast (Saccharomyces pastorianus): Ferments cold (48-55F), slower (4-8 weeks), clean and crisp
Liquid yeast (White Labs, Wyeast): More variety, requires starter for best results
Dry yeast (Fermentis, Lallemand): Convenient, long shelf life, fewer varieties
Look up BJCP (Beer Judge Certification Program) style guidelines for targets
OG, FG, IBU, SRM (color), ABV ranges defined for each style
Start by cloning a recipe for a beer you like, then modify
Everything that touches the beer after the boil must be sanitized. Contamination is the #1 cause of bad homebrew.
Clean first: Remove visible dirt, residue, labels with PBW or OxiClean
Sanitize: Submerge or spray with Star San solution (1 oz per 5 gallons water)
Star San contact time: 30 seconds minimum
Do not rinse (despite the foam - "don't fear the foam")
Sanitize: Fermenter, airlock, siphon, tubing, bottles, caps, hydrometer, thermometer, spoon - everything
Anything that goes into the boiling wort (boiling kills everything)
The boil kettle
Mash equipment (hot wort from mashing is not yet susceptible in the same way)
Ale fermentation: 62-68F actual beer temperature (not ambient room temp)
Note: Fermentation generates heat; beer may be 5-10F warmer than room
Too warm: Fusel alcohols (harsh, solvent-like), excessive esters (banana, bubblegum)
Too cold: Slow or stalled fermentation, sluggish yeast
Solution: Swamp cooler (fermenter in tub of water with frozen bottles) or fermentation chamber (freezer + Inkbird controller)
Lag phase (0-24 hours): Yeast adapting, no visible activity
Active fermentation (1-4 days): Vigorous bubbling, krausen (foam) forms
Conditioning (4-14 days): Bubbling slows, yeast cleans up byproducts
Completion: Gravity stable over 2-3 days, krausen drops
Airlock bubbling within 24-48 hours
Thick krausen layer (brown foam)
Beer smells yeasty but not foul
Gravity drops as expected
No activity after 48 hours: Yeast may be dead, temperature too low, or poor seal on fermenter
Foul smell (sour, vinegar, vomit): Contamination - may still be drinkable, wait and see
Pellicle (white film on surface): Likely wild yeast or bacteria contamination
Priming sugar: 3/4 cup corn sugar per 5 gallons (produces ~2.5 volumes CO2)
Use a priming sugar calculator for style-specific carbonation
Fill bottles with minimal splashing (oxidation = cardboard flavor)
Cap immediately
Condition at room temperature 2-3 weeks
Refrigerate before drinking (cold conditioning improves clarity and flavor)
No bottle cleaning or capping
Force carbonate in 24-48 hours (vs 2-3 weeks bottle conditioning)
Adjust carbonation level precisely
Easier to serve and share
Less oxidation risk
Initial investment higher but saves time long-term
Transfer beer to sanitized, purged keg (fill keg with CO2 before racking beer in)
Seal keg, set CO2 to 30 PSI, shake keg for 2-3 minutes
Refrigerate overnight
Reduce to serving pressure (10-12 PSI at 38F for most styles)
Or: Set to serving pressure and wait 7-10 days (slower but more consistent)
American Pale Ale: Moderate bitterness, citrusy hops, light malt backbone. Forgiving recipe.
American Wheat: Light, refreshing, low bitterness, mild wheat character. Very easy to brew.
Irish Stout: Dark but light-bodied, roasty, dry. Uses small amount of roasted barley.
English Bitter/ESB: Malt-forward, earthy hops, sessionable. Classic and simple.
American IPA: Bold hop character, moderate to high bitterness. Popular and educational.
Belgian Witbier: Wheat, coriander, orange peel. Yeast creates banana and clove.
Porter: Dark malt complexity, moderate strength. Multiple sub-styles to explore.
Hefeweizen: Banana and clove from Bavarian yeast at proper fermentation temperature.
Saison: Farmhouse ale, peppery, dry, complex yeast character. Ferment warm (80F+).
Lagers (all): Require temperature control and extended cold conditioning (4-8 weeks)
Belgian Tripel/Quad: High alcohol, complex yeast character, requires careful fermentation management
Sour beer: Wild yeast and bacteria, months to years of aging
Barleywine: Very high gravity, requires healthy yeast pitch, long aging
| Off-Flavor | Tastes/Smells Like | Cause | Fix |
|---|---|---|---|
| Acetaldehyde | Green apple | Incomplete fermentation | Let beer finish fermenting, warm slightly |
| Diacetyl | Butter, butterscotch | Yeast stress, cold crash too early | Diacetyl rest (raise to 65F for 2-3 days before cold crash) |
| DMS | Cooked corn, creamed corn | Short boil, slow cooling | Vigorous 60-min boil, rapid cooling |
| Fusel alcohols | Hot, solvent | High fermentation temperature | Control temp, pitch adequate yeast |
| Phenol | Band-Aid, medicinal | Wild yeast, chlorine in water | Better sanitation, use campden tablet for water |
| Oxidation | Cardboard, paper, stale | Oxygen exposure post-fermentation | Minimize splashing, purge with CO2 |
| Sour/acidic | Vinegar, lactic | Bacterial contamination | Better sanitation |
| Astringent | Harsh, tannic, mouth-puckering | Oversparging, grain crush too fine, pH too high | Monitor sparge volume and runoff gravity |
Affects mash pH (enzyme efficiency)
Affects hop perception (sulfate enhances hop bitterness perception)
Affects malt perception (chloride enhances malt sweetness)
Affects final beer flavor
Calcium (Ca): 50-150 ppm. Promotes clarity, yeast health, enzyme function
Sulfate (SO4): Enhances hop crispness. High for IPAs, low for malty styles
Chloride (Cl): Enhances malt fullness and sweetness. High for stouts, low for hop-forward
Sulfate-to-Chloride ratio: >2:1 for hoppy beers, <1:1 for malt-forward beers, ~1:1 for balanced
Get your water report (from municipal water utility, usually free online)
Or test your water (Ward Labs mail-in test, ~$30)
If your water has chlorine/chloramine: Add one Campden tablet per 20 gallons (removes chlorine instantly)
Use brewing water calculators (Bru'n Water spreadsheet, Brewfather app) to adjust minerals
Common additions: Gypsum (calcium sulfate), calcium chloride, lactic acid (pH adjustment)
Use your tap water with a Campden tablet
If water tastes good to drink, it will probably make good beer
Focus on sanitation and fermentation temperature first; refine water chemistry later
Handle boiling wort carefully - severe burns possible
Use proper ventilation when using propane burners (outdoor only)
Glass carboys can break and cause serious cuts (consider PET carboys or buckets)
CO2 can accumulate in enclosed spaces (dangerous in walk-in coolers or small rooms)
Pressurized kegs must be handled carefully (never exceed rated pressure)
Clean up spills immediately (wort is sticky and attracts insects)
Brew responsibly and share responsibly
Phase 1: Brew a kit (extract + yeast, instructions included) to learn the process
Phase 2: Brew extract recipes from books/online, understand ingredient roles
Phase 3: Transition to all-grain, control fermentation temperature, start kegging
Phase 4: Design original recipes, enter homebrew competitions, refine technique
Phase 5: Advanced techniques (sour beer, lagers, barrel aging), water chemistry
Phase 6: BJCP certification, teach others, consider going pro
Books: "How to Brew" by John Palmer (free online at howtobrew.com, essential reading)
Books: "Designing Great Beers" by Ray Daniels (recipe formulation)
Software: Brewfather (web/app, $28/year), BeerSmith ($28)
YouTube: Clawhammer Supply, BrewDog DIY Dog recipes, The Homebrew Challenge
Reddit: r/homebrewing (very active, helpful community)
Local homebrew shop: Ingredients, equipment, and invaluable advice
Homebrew club: AHA (American Homebrewers Association) club finder
BJCP Style Guidelines: Free PDF at bjcp.org
Deliver the response as a structured document with clear headings and actionable content. Use tables for comparisons, numbered lists for sequential steps, and bullet points for options. Include specific examples where applicable.
[Homebrewing deliverable]
1. Context and objectives
2. Analysis or framework
3. Specific recommendations with rationale
4. Action items with timelineInput: "Help me with homebrewing for a mid-size project."
Output: A complete homebrewing framework tailored to the specific context, with actionable steps, relevant considerations, and measurable outcomes.
SKILL.md
391 lines · 2,762 words
The text of SKILL.md is shown as it downloads, under the Apache-2.0 license, by Ferrox Labs. The license is the one in the file's own frontmatter.
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