The Compendium

Why quality begins with cleanliness

Beer is a biological product built on selective pressure: you want Saccharomyces and a defined ecosystem, not a lottery of wild flora. Every surface that touches wort or beer after the boil is a potential inoculation site. That makes sanitation the boundary between process engineering and hope.

Cleanliness is two layers: clean (soil removed) and sanitized (viable cell counts reduced to a level your process can tolerate). You cannot sanitize through a film of organic residue — detergents and elbow grease come first; sanitizer is the final gate.

Treat your cold side like a lab bench: closed transfers, minimal splashing, and a default assumption that air and hands are carrying passengers. Consistency on sanitation is what lets you attribute flavor changes to recipe tweaks instead of mystery microbes.

Chemical primers (reference)

Alkaline cleaners (PBW-type) hydrolyze protein and lift mineral films. Acid cycles handle beer stone and passivation on stainless. Iodophor and acid-based no-rinse sanitizers trade contact time for convenience — read the label, measure by volume, and never mix concentrates blindly.

Rest geometry

Beta-amylase favors the lower end of saccharification (~145–152°F / 63–67°C); alpha-amylase tolerates higher temperatures and helps limit dextrin profiles when paired with adequate time. Single-infusion is a compromise — track strike temperature, grain mass, and liquor ratio; they set the entire envelope.

pH near 5.2–5.6 in the mash (room-temperature measurement) keeps enzymes in a useful window and reduces tannin extraction from husks when sparging hot.

Efficiency vs. body

Measure pre-boil gravity against volume to separate lauter performance from boil concentration. If your OG drifts batch-to-batch, fix process before chasing new recipes.

Hop isomerization & timing

IBU is a function of alpha content, boil time, gravity, and volume. Late additions skew flavor over bitterness; calculate total IBU as a sum of contributions, not vibes.

Break material and DMS drive-off depend on a rolling boil. Weak boils under-volume concentrate sugars without the same volatile strip — watch evaporation rate as part of equipment characterization.

Pitch & temperature control

Underpitching stresses yeast; overpitching can flatten character in styles that rely on growth-phase byproducts. Match strain specs to your OG and volume.

Temperature is a control variable, not a comfort setting. Lagers especially require stable sub-ambient regimes — track air vs. wort temperature; they are not identical.

Bottling & keg fills

Carbonation math uses dissolved CO₂ targets by style. Priming sugar calculators assume fully attenuated beer and correct volume — verify FG stability before packaging.

For kegs, pressure and temperature follow Henry’s law intuition: colder liquid holds more gas at the same head pressure.

Volume — liters & gallons

Temperature — °F ↔ °C

Formula: °C = (°F − 32) × 5/9 · °F = °C × 9/5 + 32. Mash and fermentation setpoints are easier to compare once both columns are in the same unit system.

Mass — ounces & grams