# Cleaning, Sanitation & Safety Clean and sanitary equipment is the single most effective quality control measure available to any brewer. Understanding the difference between cleaning and sanitizing — and applying each correctly — eliminates the majority of contamination-related off-flavors and batch losses. *** ## Cleaning vs. Sanitizing: A Critical Distinction These are two separate, sequential steps. Sanitizers cannot work effectively on surfaces that are not first clean. | Step | Purpose | Agents | | -------------- | ------------------------------------------------------------------ | -------------------------------------------------------------- | | **Cleaning** | Remove organic soil: wort, yeast, trub, hop debris, proteins, fats | PBW, OxiClean Free, caustic soda, hot water | | **Sanitizing** | Reduce microbial load to a safe level on a clean surface | Star San, Iodophor, bleach (when correctly diluted and rinsed) | > A dirty surface cannot be sanitized effectively. Organic matter shields microorganisms from sanitizer contact and neutralizes many sanitizer chemistries. *** ## Common Cleaning Agents ### PBW (Powdered Brewery Wash) * **Type:** Alkaline, oxidizing cleaner (sodium percarbonate + sodium metasilicate blend) * **Concentration:** \~14–28 g per 4 L (1–2 oz per US gallon) for standard soiling; up to 42 g/4 L for baked-on deposits * **Temperature:** More effective warm; 40–60 °C (100–140 °F) speeds action significantly. Works at room temperature with longer soak. * **Contact time:** 20–30 min soak for light soiling; overnight for heavy deposits * **Rinse:** Rinse thoroughly with clean water before sanitizing * **Compatibility:** Safe for stainless steel, glass, plastic, rubber. Do not use on soft metals (aluminium, copper — will cause pitting). * **Notes:** Biodegradable; wear eye protection and gloves when handling concentrates or prolonged soaks ### OxiClean Free * **Type:** Sodium percarbonate-based cleaner (fragrance/surfactant-free variant only) * **Concentration:** \~14 g per 4 L (1 oz/US gal) * **Notes:** Economical substitute for PBW; effective for basic cleaning but lacks the silicate package optimizing it for stainless. Do not use scented or standard OxiClean (surfactant residue). ### Caustic Soda (NaOH / Lye) * **Type:** Strong alkaline cleaner * **Use case:** Industrial CIP (Clean-in-Place) in larger-scale breweries; not typically used in homebrewing * **Safety:** Extremely corrosive. Causes severe chemical burns on skin and eyes. Requires full PPE (gloves, goggles, face shield, chemical-resistant apron). ### Hot Water * Adequate for rinsing and pre-soaking. Not sufficient alone for sanitizing (would require sustained temperatures above 77 °C / 170 °F for extended contact, impractical for most equipment). *** ## Common Sanitizers ### Star San (No-Rinse Phosphoric Acid Blend) * **Type:** Acid-based no-rinse sanitizer (phosphoric acid + dodecylbenzene sulfonic acid) * **Concentration:** 1 mL per 1 L of water (approximately 1 oz per 5 US gallons) * **Contact time:** 1–2 minutes of full surface contact * **Rinse:** **No rinse required.** Residual sanitizer at use concentration is harmless and flavorless at these levels. * **Foam:** Foam is normal and harmless — the common phrase among homebrewers is *"don't fear the foam."* The active compound is in the liquid, not destroyed by foam. * **pH:** Use concentration should be below pH 3.0 for efficacy; hard water raises pH and reduces effectiveness. Mix with distilled or RO water if local water is very hard. * **Shelf life (diluted):** Follow manufacturer guidance. In practice, many brewers either mix fresh each session or verify reuse by checking both clarity and pH (<3.0) * **Compatibility:** Safe for stainless steel, glass, plastic (all types), rubber. Do not use on soft metals. ### Iodophor * **Type:** Iodine-based sanitizer (iodophor = iodine + carrier) * **Concentration:** Typically \~12.5 ppm available iodine (often around 0.5 oz per 5 US gal, depending on product strength). Always follow the product label * **Contact time:** 2 minutes minimum * **Rinse:** At correct concentration, no rinse required. Higher concentrations require rinsing and will stain. * **Notes:** Can stain plastic permanently with repeated use. Beer-brown coloration of solution indicates active; colorless solution is exhausted. ### Potassium Metabisulfite (K-Meta) * **Type:** Sulfite compound mainly used for water treatment (chlorine/chloramine removal) and in wine/cider workflows * **Brewery note:** Not typically relied on as a primary no-rinse sanitizer for beer cold-side equipment * **Water treatment rule of thumb:** \~1 Campden tablet per \~75 L (20 US gal) of brewing water for typical municipal chloramine/chlorine levels; adjust based on water report and product label ### Bleach (Sodium Hypochlorite) * **Type:** Oxidizing sanitizer * **Concentration:** Target 50–100 ppm available chlorine (for 5–6% unscented household bleach, roughly 4–8 mL per 4 L water; exact dose depends on bleach strength) * **Contact time:** 10–20 minutes * **Rinse:** **Must rinse thoroughly** with clean water. Chlorine residue can create chlorophenols (medicinal off-flavor) on contact with wort phenolics. * **Notes:** Loses potency rapidly in hot water or organic-contaminated solution; store bleach solutions away from light. Do not mix with acid sanitizers (produces chlorine gas). *** ## Process Hygiene Checkpoints Apply the following checklist at each brewing stage: ### Pre-Brew * [ ] All equipment cleaned and visually free of organic residue from previous use * [ ] Fermenter inspected for scratches, cracks, and persistent odors (replace damaged plastic) * [ ] Water treated for chloramine if required (Campden tablet) * [ ] All rubber gaskets/O-rings cleaned and sanitized ### Post-Boil & Transfer * [ ] All cold-side equipment (fermenter, auto-siphon, tubing, airlock) sanitized immediately before use * [ ] Minimize splashing during transfer (oxidation risk + contamination risk) * [ ] Yeast pitched hygienically from sanitized vessel ### Fermentation * [ ] Airlock filled with sanitizer solution (Star San) rather than water (prevents blow-back contamination) * [ ] Any sampling equipment (thief, wine thief, hydrometer) sanitized before each use * [ ] Temperature probe (if used) sanitized before insertion (follow probe manufacturer guidance for compatible sanitizers) ### Post-Fermentation / Packaging * [ ] All packaging equipment (keg, bottles, caps, bottling wand) cleaned then sanitized * [ ] Keg purged with CO₂ before filling * [ ] Bottles visually inspected before use; discard any with chips, cracks, or permanent odors *** ## Material Compatibility Summary | Material | Alkaline Cleaners (PBW) | Acid Sanitizers (Star San) | Bleach | Notes | | ----------------------------------- | ----------------------- | -------------------------- | ----------------- | --------------------------------------------------------------- | | Stainless steel | ✅ | ✅ | ✅ (short contact) | Avoid chloride-heavy cleaners long-term (pitting risk) | | Glass | ✅ | ✅ | ✅ | No concerns | | Food-grade plastic (HDPE, LDPE, PP) | ✅ | ✅ | ✅ | Replace when scratched | | Silicone | ✅ | ✅ | ✅ | Highly resistant | | Rubber (gaskets, O-rings) | ✅ | ✅ | ⚠️ | Bleach can degrade rubber over time | | Aluminium | ❌ | ⚠️ | ⚠️ | Alkaline cleaners cause pitting; avoid | | Copper | ❌ | ⚠️ | ⚠️ | Alkaline cleaners cause pitting; use specialized copper cleaner | *** ## Brewery Safety Guidance ### Chemical Handling * Always read and follow the manufacturer's Safety Data Sheet (SDS/MSDS) for every chemical used. * **Add chemical to water, not water to chemical** — especially for concentrated acid or alkaline solutions — to control exothermic reactions. * Store cleaning and sanitizing chemicals separately from food and away from children and pets. * Do not mix bleach with acid-based cleaners or sanitizers; mixing chlorine bleach with acids releases toxic chlorine gas. * Store propane cylinders and compressed gas tanks in a cool, ventilated area away from ignition sources. ### Personal Protective Equipment (PPE) * **Minimum recommended:** Safety glasses or goggles when handling any chemical solutions; nitrile gloves for concentrated agents. * **Strongly recommended for caustic/strong acid:** Full face shield, chemical-resistant gloves, apron. ### Hot Liquids * The leading cause of brew day injury is hot liquid spills. Use insulated gloves when handling boiling wort. * Maintain a clear, dry floor around the brew kettle; wort spills on wet surfaces create slip hazards. * Never leave a boiling kettle unattended — boilovers occur rapidly. * Use a wort chiller rather than ice-bath immersion for large volumes to reduce burn risk. ### Ergonomics * A full 20-L (5-gal) pot of hot wort weighs approximately 20 kg (44 lb). Plan lifts accordingly — use a pump or siphon rather than lifting where possible. * Grain bags and malt sacks are heavy; lift with legs, not your back. ### Electrical Safety * Immersion heating elements must be used with a properly rated RCD/GFCI (Ground Fault Circuit Interrupter). * Keep electrical connections dry and away from liquid pathways. * Never leave heating elements energized in a dry vessel. ### Gas & Ventilation * CO₂ is a colorless, odorless asphyxiant. Fermenting beer produces significant CO₂. Never ferment in a sealed room with no ventilation, and be cautious when working in low areas near actively fermenting vessels. * When purging kegs, do so in a ventilated area. CO₂ accumulates at floor level. * Propane burners should only be used outdoors or in fully ventilated spaces. *** ## Cleaning & Sanitation Schedule | Frequency | Task | | --------------- | --------------------------------------------------------------------------------------------------------- | | After every use | Rinse equipment immediately with cold water (prevents protein baking on). Clean with PBW within 24 hours. | | Before each use | Sanitize all cold-side equipment immediately before contact with wort or beer. | | Monthly | Deep-clean tap lines, connections, and draft equipment. Inspect gaskets for wear. | | Annually | Inspect and replace aged plastic tubing, rubber gaskets, and any cracked plastic vessels. | *** > **Brewfather Tip:** Use Brewfather's **Batch Steps** (Brewing, Fermenting, Completed) to add custom notes on your cleaning and sanitation process — e.g., noting which sanitizer was used, whether a diacetyl rest was performed, or flagging equipment that was inspected. These notes become invaluable for diagnosing off-flavors later. You can also use the **Miscs** ingredient category to log sanitation products (Star San, PBW) in your recipe/batch for full process traceability. *** ## Sources * Palmer, J.J. (2017). *How to Brew: Everything You Need to Know to Brew Great Beer Every Time* (4th ed.). Brewers Publications. * Briggs, D.E., Boulton, C.A., Brookes, P.A., & Stevens, R. (2004). *Brewing: Science and Practice*. Woodhead Publishing. * Bamforth, C.W. (2006). *Scientific Principles of Malting and Brewing*. American Society of Brewing Chemists. * White Labs Technical Bulletin: Brewery Sanitation Best Practices. * Five Star Chemicals: Star San product page, technical sheet, and SDS. * U.S. EPA registered label resources for BTF Iodophor Sanitizer (product label directions/concentrations). * U.S. FDA Food Code (chemical sanitizer concentration guidance for food-contact surfaces). * OSHA General Industry Standards (29 CFR 1910): Hazard Communication and PPE requirements. * National Fire Protection Association (NFPA) 58: Liquefied Petroleum Gas Code (propane storage/use). ## Related docs * [Fundamentals](https://docs.brewfather.app/brewing-knowledge/fundamentals) * [Troubleshooting](https://docs.brewfather.app/brewing-knowledge/troubleshooting)