FAQ
Common questions
Where do I get a SCOBY?
The best source is a friend who brews — they have extra SCOBYs and can give you a cup of starter liquid at the same time. Second best is Cultures for Health (mail-order, reliable). You can also grow one from a bottle of plain GT's Synergy kombucha over 2-3 weeks, though it takes longer. Never use a dehydrated SCOBY without also getting starter liquid — the liquid is what actually protects the batch from mold.
How long does first fermentation take?
Usually 7-14 days depending on temperature. At 76°F, most batches are ready around day 9. At 68°F, plan for 12-14 days. Below 65°F, fermentation stalls. Taste it on day 7 with a clean straw: if still mostly sweet, give it more time; if pleasantly tart with a slight vinegar note, it's ready to bottle.
Can I use tea bags instead of loose leaf?
Yes — 8 standard black tea bags per gallon works fine. Just avoid flavored teas (Earl Grey, chai, fruit teas) and herbal teas: the SCOBY bacteria need caffeine and tannins from real tea. Decaf doesn't work well. Plain black, green, or oolong are the safe choices.
What does mold look like, and is it serious?
Mold looks like dry, fuzzy spots — usually white, blue, or black — on the surface of the SCOBY. It's uncommon if you used enough starter liquid and kept the vessel covered. If you see mold, discard the entire batch including the SCOBY — it can't be saved. Brown strings floating in the liquid, a tan or brown SCOBY, and a vinegary smell are all normal and not mold.
What is second fermentation and is it required?
Second fermentation (F2) is when you bottle the finished kombucha with a small amount of fruit juice, seal it tight, and leave it at room temperature for 2-4 days. This builds carbonation. It's not required — still kombucha is perfectly good — but F2 is what creates the fizzy, flavored bottles you're used to paying $5 for.
How much does home-brewed kombucha cost versus store-bought?
After the upfront gear investment, a gallon batch (about 12 bottles) costs roughly $1-2 in tea and sugar — about $0.10-0.15 per 12-oz serving versus $4-5 for a store bottle. The gear pays for itself within 3-4 batches.