Kombucha Troubleshooting

🔍 "I think I see mold"

Short answer: it's probably a new SCOBY forming, not mold. Mold is fuzzy, dry-looking, lives on the surface only, and comes in bread-mold colors. White specks, jelly films and brown strings are all normal fermentation. This question deserves its own page — with a side-by-side table:

The full "Is this mold?" guide →

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🧬 "What's that stringy thing floating in my kombucha?"

Healthy yeast. Brown, dangly, slightly alarming strands are the workforce that ferments your tea and carbonates your bottles. They're supposed to be there. If the look bothers you, strain as you pour — but never try to scrub your brew "clean" of them.

🎥 What's that stringy thing in my kombucha? (60-second answer) · Should I strain it?

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🫖 "How do I know it's actually fermenting?"

Taste it over time — that's the real test. If it's getting progressively less sweet and more tart, fermentation is happening, full stop. Supporting signs: a new film forming on the surface, little bubbles at the edges, that faint vinegary aroma. A new SCOBY growing is a good sign, but its absence isn't a bad one (cool rooms often skip it). If nothing changes in taste after 10+ days, your room may be too cold or your starter too weak — warm it up (heat mats help) and use 2 full cups of stronger starter next round.

📖 What to expect during F1 · When is it done?

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🫧 "My kombucha won't carbonate"

Work this list in order — it's sorted by likelihood:

1. Give it more time. 3 days is a minimum at room temperature; cold kitchens can need a week-plus.
2. Check your caps. A less-than-airtight seal is the silent fizz killer. Tighten with a rubber gripper; make sure rims and caps are dry when sealing.
3. Check your bottles. Decorative and repurposed bottles often can't hold pressure. Use pressure-rated ones →
4. Feed the yeast. Flavor with pureed or juiced fruit (pineapple is rocket fuel); chunks and low-sugar flavorings ferment slowly.
5. Stir before bottling. Settled yeast means some bottles got no workforce.
6. Test cold, not warm. Chill a bottle fully before judging fizz — warm opens always seem flatter or wilder than reality.
7. Still flat after several batches? Some cultures just carry lazy yeast — consider adopting a SCOBY from a fizzy-brewing friend.

📖 The full carbonation guide · 🎥 Carbonation basics video

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🌋 "It carbonated TOO much — I made a geyser"

Congratulations, your yeast is thriving! To keep it in the bottle: chill completely before opening (cold liquid holds CO₂), open over the sink, and strain pulpy brews. Next batch: shorten room-temperature time by a day or two, or use slightly less sugary flavoring. Fermenting long on purpose for a drier brew? That's the one case where burping every 2–3 days makes sense.

📖 F2 timing guide · 🎥 Tips for fizzy messes & smelly vessels

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💥 "My bottle broke / I'm scared of explosions"

Bottle failures almost always trace back to bottles that were never meant for pressure — decorative jars, thin glass, repurposed non-carbonated drink bottles. The fix is equipment, not fear: buy genuinely pressure-rated bottles, seal them tight, and store them somewhere a surprise wouldn't be a disaster (a plastic tub works great for peace of mind while you learn your rhythm).

🎥 How to avoid bottle explosions · Where Ange gets her bottles · 📖 Bottles & caps guide

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🍾 "Do I need to burp my bottles?"

No. Burping vents the carbonation you're trying to build, and a room-temperature fizz check misleads you anyway. With quality bottles, skip it. The exception: long room-temperature ferments for dry kombucha — then burp every 2–3 days. The full burping breakdown →

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👅 "It's too sweet / too sour / weirdly bland"

• Too sweet? It just needs more time in F1. Taste every day or two until the tartness catches up.
• Too sour? You went long — still completely usable. Bottle it with sweeter, juicier flavorings to rebalance, mellow it with juice at serving time, or bank it as powerful starter tea. 🎥 Fixing too-sweet/too-sour · How to mellow kombucha
• Bland? More flavoring than feels polite, pureed rather than chopped — and a small hit of lemon or lime to wake everything up. 🎥 Can you fix bland kombucha?

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🥞 "My SCOBY sank / looks weird / didn't grow"

• Sank? Fine. Floats sideways? Fine. Bumpy, holey, ugly? Fine. SCOBYs have no beauty standards.
• No new SCOBY grew: usually a cool room or a jostled jar — and by itself it doesn't mean failure. Trust the taste test instead. 🎥 Why didn't my brew grow a SCOBY?
• Flavoring touched your SCOBY: don't return it to plain brewing — hotel it separately or retire it. 🎥 What to do →

📖 Full SCOBY care guide

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🧪 "A recipe told me to use vinegar"

Skip it — use strong kombucha starter tea instead. Here's the real talk, because this one earns Ange a lot of clarifying questions: kombucha is itself a very specific type of vinegar culture. Different vinegars are produced by different vinegar cultures — so when a recipe says to add distilled white or apple cider vinegar, it's introducing a different culture, with a different pH and very different flavors, into a brew that's meant to stay a kombucha culture. That's when things get thrown out of balance.

In Ange's side-by-side tests, and in conversations with hundreds of other homebrewers, the people who add white vinegar to their kombucha run a higher risk of overly acidic, overly astringent, imbalanced brews that don't hold up well over time. So if a recipe calls for kombucha, kickstart it with the purest kombucha "vinegar" there is: strong, unflavored starter tea.

The add-vinegar advice is a fossil from decades ago, when real raw kombucha was hard to find. Plain, unflavored kombucha is everywhere now — there's no need to lean on other vinegars to bring your pH down. Already used vinegar? 🎥 Here's how to recover · Why other vinegars are unnecessary

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🪰 "Fruit flies found my brew"

Prevention is the whole game: a tightly-woven cloth (not cheesecloth — flies laugh at cheesecloth) secured with a snug rubber band. If flies got inside the vessel, sadly, toss the batch and start over with a tighter cover — larvae are not a flavor note anyone wants.

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👃 "My vessel smells funky"

Some funk is fermentation being fermentation, but lingering off-smells usually mean built-up yeast and residue. Rinse well with hot water between batches (skip harsh antibacterial soaps that leave residue — they're rough on cultures), and give vessels an occasional deep clean. 🎥 Tips for smelly vessels · Cleaning your materials