Most kombucha problems fall into one of three categories: actual contamination (mold, which requires discarding the batch), fermentation issues (too sour, not sour enough, flat second fermentation), or SCOBY appearance concerns that look alarming but
John Brewster
John Brewster
John Brewster is the homebrewer and writer behind BrewMyBeer — over a decade of all-grain brewing, 80+ BIAB batches, and 1,000+ guides on fermentation science, water chemistry, hops, yeast, and homebrewing equipment. Every guide is written from genuine hands-on experience.
- Troubleshooting
Fixing Stuck Fermentations With Rescue Techniques for All Beverages
by John Brewster 5 minutes readA stuck fermentation means gravity has stopped dropping before reaching the expected final gravity — not that airlock activity slowed down, which is normal.
- Troubleshooting
Off-Flavors in Homebrewing With Identification and Prevention
by John Brewster 5 minutes readOff-flavors in homebrew almost always have a specific, identifiable cause — and most are preventable once you know what to look for.
- Troubleshooting
Why Is My Brew Not Fermenting With Common Causes and Solutions
by John Brewster 5 minutes readFermentation that looks stuck usually isn’t — it’s either finished, slower than expected, or fermenting without visible airlock activity. Before doing anything, take a hydrometer reading.
- Beer Brewing
Creating Your Own Best Brewing Recipes With Formulation Principles
by John Brewster 5 minutes readFormulating your own brewing recipes starts with understanding three things: style guidelines (target gravity, color, bitterness, and character), ingredient function (what each malt, hop, and yeast contributes), and the math that connects them (how t
Barrel aging imparts flavors that no other technique can replicate — vanilla, coconut, caramel, and toasted oak from the wood itself, plus residual spirit character from whatever previously lived in the barrel.
- Craft Ferments
Secondary Fermentation Techniques for Clearer, Better-Tasting Beverages
by John Brewster 5 minutes readSecondary fermentation — racking your beer, wine, or mead off the primary yeast cake into a clean vessel — matters most for three things: clarity, off-flavor reduction, and controlled conditioning.
- Equipment & Tools
Temperature Control Mastery for Consistent Brewing Results
by John Brewster 5 minutes readTemperature affects every phase of brewing — mash enzyme activity, fermentation flavor profile, conditioning speed, and serving character.
- Craft Ferments
Wild Fermentation With Capturing and Using Natural Yeasts
by John Brewster 6 minutes readWild fermentation uses yeast and bacteria already present in your environment — on fruit skins, grain husks, in the air — rather than commercial cultures.
Different grape varieties demand different fermentation approaches. The grape’s sugar level (Brix), natural acidity (pH), tannin content, and aromatic compound profile each influence what temperature you ferment at, how long you macerate on skins, wh