How to Brew Kombucha : A day by day Analysis
This entry was posted on May 13, 2014.
To the right is my fresh brew! The tea and sugar has steeped and dissolved, and we have added the culture (floating in the background). We will be following it over the next couple days to see how a typical kombucha brew progresses.
As your brew ferments, you will notice changes in the nute (nutritional starter). Most notably will be the formation of the new "baby SCOBY on the surface. This process begins in most brews between twenty-four and seventy-two hours.
Small white patches will begin to form on the surface of the liquid, independent of the SCOBY you put in there. The first few days are an uneasy time for new brewers, and the new growth of SCOBY is often misconstrued as mold. For more info about mold, check here at our Brew FAQ.
We are still at the dawn of our ferment and must be patient. My starter SCOBY has floated back up which is totally OK ( so is a sunken SCOBY). It is very important during these early stages not to disturb or otherwise agitate the kombucha; one small wave can sink new formations, which slows the primary acidification process and increases the risk of mold.
At this point you may have some questions or just want to know more on how to brew kombucha. What better way to learn-and-brew than dive into a good read? See our selection of brewing books here.
I highly suggest for beginners our company's co-founder written book Kombucha! It's where a good chunk of this blog's body comes from. And for people who would like to expand their know-how on all other things fermented, I suggest The Art of Fermentation by Sandor Ellix Katz; a Michael Pollan / Harold McGee scientific break-down on all that bubbles. True Brews by Emma Christensen, on the other hand, is a beautifully laid out guide on how to make and tastily enhance all that bubbles: cider, soda pop, beer, wine, sake, soda, mead, kefir, kombucha, and fruit wines.
SCOBY formation: As the culture matures, these spots of new growth will become thicker and wider, eventually joining together and becoming one whole party. Wheee! SCOBY Party! Give your brew a sniff - it is important to know the smells as well as the sights of your brew as it transforms.
See KBBK SCOBY-power in action! that's a lot of growth in just five days. Your brew may not be here just yet, so you may need to give it an extra day or two. So, it has formed it's signature celluloid patty, the SCOBY. If you do not see anything resembling the SCOBY in these pictures, you may be in trouble - ambient temperature could be too low and is slowing the culture's metabolism, or other brewing issues may have arisen. If you see dark patches or strange tentacle looking formations such as in the inset picture above, no need for alarm. This is just spent yeast, a natural bi-product of the fermentation process. See our Brew FAQ for more info. Again, keep your brew covered! From the pictures it may seem that this is an open-air ferment, but it is just for visual reference.
Taste your Brew: When the new baby SCOBY has spread across the entire surface of your brew and started to thicken, you should give your 'buch a taste. This will usually be in the three- to six-day range but can take longer depending on the strength of your culture, how long you have been brewing in that location, the type of tea and sugar used, and the temperature. Lots of changes have already occurred in your brew at this point and the flavor will give you an idea of how much longer you will want to brew your ferment. Just make sure that if you dip something into your 'buch, it is clean.
As long as your brew is healthy and progressing normally, it's always safe to drink from the nute stage all the way through to vinegar.
Some ideas on how to get a sip:
- Stick a straw under the surface of the SCOBY
- Use a clean shot glass to gently push the SCOBY down and scoop a little from the surface
- Use a Thief! These are the professional brewers sampler. (Available here)
A pH indicator measures the activity of hydrogen ions in a solution. The more free-floating hydrogen ions there are, the lower pH will be, indicating a higher acid profile. For the kombrewer with pH indicator strips, your buch will be ready on the sweet side at a pH of 3.1 and on the sour side at a pH of 2.7.
Behold, the magic of fermentation! You have just learned how to make kombucha. Millions of microorganisms in the SCOBY are happily feeding off of sugars and tea nutrients, breaking down alcohols, and multiplying. This pro-biotic adventure has come full circle.
Unfortunately due to an accident, the jar broke before I could take a side shot. The second photo above is from a different brew, but is a similar and healthy SCOBY.
When to bottle: Your brew, although young, is complete. Most one-gallon brews kept around 78ºF will have a nice balance of sweet and sour flavors at nine days. I like to bottle at about seven days in my kitchen when there is a little more sweetness than I would want to drink. This ensures that there will be enough sugar to produce effervescence in secondary fermentation after bottling. If you haven't yet picked up bottling equipment, I highly suggest our Pro-Bottler Package, it's six 32oz Amber Growlers, a brewers must-have Auto-siphon, and a mixed flavor pack with enough goodies to flavor all six of those Growlers.
Whether you bottle your 'buch for some extra bubble or just pour out a cup straight-up, it's time to enjoy the pro-biotic and fizzy goodness that is home-brew kombucha. Feel it's not complete without a snazzy Kombucha Brooklyn Highball glass? Go ahead and deck out your glassware collection.