Batch brew vs. continuous brew

Batch brew vs. continuous brew · Watch on YouTube

One thing up front: all the tips on this site pertain to batch brewing unless otherwise stated — it's the method Ange prefers for her lifestyle and the kombucha she likes to drink. Some tips apply to CB too, but there are nuances. And there's no community consensus that either method makes better kombucha — but if you're just getting started, Ange recommends batch brewing for the most consistent results.

What is batch brewing?

As the name suggests: making kombucha in individual batches or cycles. You have a brew day — sweet tea + SCOBY + starter tea, usually in 1-gallon jars (brew as many jars as you like) — then let it sit for 1–2 weeks at room temperature (first fermentation). If you flavor and carbonate, you have a bottling day: add fruit, bottle airtight, and give it another 3–4 days at room temperature (second fermentation). Start a new cycle anytime you have SCOBYs and starter tea to spare.

What is continuous brewing (CB)?

Also as the name suggests: more continuous work and continuous "harvesting." CB brewers use a larger vessel (often 2+ gallons) with a spigot. Whenever you harvest some first-fermented kombucha from the spigot, you replace it with an equal amount of sweet tea. The SCOBY stays put, and the large volume of "leftover" kombucha acts as starter tea — so each refill ferments much faster than a batch brew, and you can harvest more often. The trade: you're feeding it sweet tea frequently, and racing to keep the vessel from getting too sour.

Points to consider (full disclosure: Ange is a batch-brew advocate)

She's tried CB; batch suits her better. So consider this a list of reasons she went batch — if you want different things from your kombucha, CB might be your winner.

• CB = kombucha "on tap." If you drink a lot of it straight after F1 — no flavoring, no bottling — and don't mind feeding the vessel a few times a week, CB can be great.
• Batch wins for fresh-fruit flavoring. With CB you'd need small amounts of fruit/juice/puree on hand at all times, in case you must bottle before the vessel over-sours. Ange prefers one big brew day (usually four 1-gallon jars), a week of ignoring them, then one big bottling day with all the fruit juiced at once — way less cleanup than constantly babysitting a CB vessel.
• CB means less SCOBY-handling. The same SCOBY can sit in the vessel up to ~6 months, growing away — less manhandling, less hygienic risk, no excess-SCOBY pileup. The flip side: a SCOBY that just sits is more prone to developing an over-abundance or imbalance of yeast, which can mean yeasty-tasting brews or vessels that turn vinegary too fast.
• The spigot giveth and taketh. Easy dispensing — but yeast settles at the bottom, right where the spigot pulls from. You'd have to stir before every harvest, which is hard with a giant CB SCOBY covering the surface. (Batch brewers: stir before bottling, always.)
• Batch gives more control over flavor. CB ferments faster (big SCOBY, big starter volume), but batch gives a wider "set it and forget it" window — let each batch run exactly as long as you like and hone in on your sweet/sour spot. Longer cycles also develop more complex flavors, which in CB vessels tend to get steamrolled by vinegary acidity.
• Batch is easier to schedule. Once you know your fermentation timeline, you can plan brew and bottling days backward from a party. With CB, the starter volume fluctuates every harvest, so pacing big batches is harder — you bottle smaller amounts, more often.
• CB without a hotel = all eggs in one basket. Easily remedied with a SCOBY hotel — but CB brewers handle their SCOBYs so rarely that hotel upkeep is easy to forget. If the one CB ecosystem fails, rebuilding is work.

Plenty of continuous brewers love having lots of kombucha on hand — but Ange's household goes through a lot (she often brews 4 gallons at a time, more before parties), and she still finds batch brewing simpler and more consistent. Look at your lifestyle: how often can you realistically check brews, steep tea, and flavor and bottle? That answers the question. (Super-high-volume brewer who also makes beer? She's used this Catalyst Beer Fermenter* for both — and see kombucha in a beer fermenter.)

On this page, you'll find some affiliate links to sources where Ange has purchased the ingredients/materials she uses. She may get a small cut of Amazon's profit for finding + recommending them to you — it won't cost you any more than you'd normally pay. She went through a lot of trial and error to find low-cost, high-quality options to save us all money. But feel free to purchase from wherever you like!