Your premier source for kombucha brewing 

Kombucha Brooklyn




The 3 rules for making perfect kombucha every brew are:

  • Fresh healthy SCOBY and starter liquid every brew. Start with the best SCOBY and starter you can get your hands on (the SCOBY that come from our lab are the best of the best). Then when you are going to start your next batch use ONLY the new SCOBY that has formed on the surface and 1 cup of starter from the top of the vessel before you bottle. That’s the first cup of kombucha not the last. By doing these two things you are keeping your microbial colony diverse and in balance. If you are keeping old SCOBY in your brew Acetobacter (most dominant bacteria in the SCOBY and the one responsible for making acetic acid which is the acid that taste like strong vinegar) takes over and starts to make you tea vinegar. If you use yeasty starter you will over populate the yeast colony and get an unpleasantly boozy brew. This rule is very important for people looking to start a “continuous brew.” You are sure to end up with vinegar if you do. See more about the reasons why you should never continuously brew here. If you are looking to take a break from brewing store your SCOBY in a tightly sealed container IN THE FRIDGE along with enough fresh starter liquid to start another brew. A SCOBY can remain unchanged in the fridge for up to 3 months.
  • Use whole pure ingredients (nutrients) for fermentation. That’s straight tea (white, green, black, oolong, pu-erh, matcha) and processed cane sugar ONLY. Herbs and non-camellia sinensis tea will only create flavor for you not nutrients for the SCOBY. If you use them they will not feed the microbes in the SCOBY, which will intern kill off many of the lesser dominant species. Pure tea is what the SCOBY is looking for so is what it should get. If you want to ferment herbs use a SCOBY from your hotel, not your main mother SCOBY. Processed cane sugar is the only sugar to be used for fermentation. Raw sugar is covered in minerals which although good for us gets in the way of the SCOBY when it's trying to break down the compounds of sugar (fructose, glucose, and sucrose). If the SCOBY can't get to the sugar it will have the same effect as above and weaken the colony. Organic is always better for the SCOBY and for but not necessary.
  • Keep your temperature at a good level and keep it as steady as possible. The temperature range for brewing is 68-86F (20-30C) but the ideal is 78-82F (25-27C). The closer you can come to that sweet spot the better your brew will be. If your temperature is below 68F your brew will not be actively fermenting and can let it unwanted microbes like wild yeast or mold. If temperature is a problem to keep, steady grab a heat mat to heat year round.
  Do these three things and you’ll be brewing like a Kombrewmaster in no time.
Why We Never Use Dehydrated SCOBY

Why We Never Use Dehydrated SCOBY 11

We receive quite a few emails regarding SCOBY health, and as a result an immense number of images and stories about home brews all over the world. The most common message we receive is on the topic of mold speculation and brew failure. After digging a little deeper, it's frequently revealed that the brewer has started their brew with a dehydrated SCOBY. We did some of our own investigating using a very commonly procured dehydrated SCOBY and wrote about our results here.  



Our customers have made some adjustments after realizing the difficulty of brewing with a dehydrated culture, much like our customer Jonny:  

Just wanted to say thank you. Wow the batch of buch that you gave me is exponentially better than the dehydrated scoby I got from the other company! Its even a little fizzy just like the stuff off the shelves and looks like its coming along fantastically . Thanks a million. -Jonny
After starting a brew with a freshly-grown SCOBY, things will move along swimmingly.  

Photos of brews from a dehydrated SCOBY

 Content below may not be suitable for some viewers. Viewer discretion is advised.  

Very weak SCOBY growth after weeks

Moldy brew from a dehydrated SCOBY

 Look closely to see your future if you brew with a dehydrated SCOBY

These cultures are definitely over-(dehyd)rated!

A beautiful but dangerous art piece

So, start your kombucha brews with fresh SCOBY every time and save yourself the ignominy of a moldy brew and the pain of losing what once was a mother with a bright, wet future!

Succession and Why We NEVER Continuous Brew

Succession and Why We NEVER Continuous Brew 68

A Common Problem :

My Kombucha tastes like vinegar.


My kombucha ferments so fast I can't control it.



Time and time again, it is because they were trying the continuous brew method. Sometimes they only continuous brewed for a few weeks before noticing a dip in quality. When they attempted to revert to batch brewing with the same culture, they discovered they had fundamentally changed the culture and could not get it back to its former glory. Here is our educated assumption of what is happening....   Succession is the observed process of change in the species structure of an ecological community over time. Many multi-species ferments are successive in their microbial activity meaning that in the beginning of the fermentation process, a certain species or set of species is active. As their activity changes the composition of the substrate (making it more acidic, for example), the conditions become unfavorable to those first pioneering species. They grow sluggish and eventually halt their activity while the new conditions they created are prime real estate for the next wave of species to succeed. And this can happen several times throughout a fermentation process.  

The succession process in fermentation is highly studied and documented in sauerkraut. In the beginning of sauerkraut fermentation, Leuconostoc mesenteroides is the pioneering species that gets going first. As this bacteria proliferates and its acid-producing activity lowers the pH in the crock, the conditions become intolerable for it. It’s kind of like if you keep setting up more and more kombucha brews in your kitchen, eventually it will become so overwhelmingly acidic smelling in there you won’t be able to go in without a respirator. (Believe me, we know). So, once Leuconostoc mesenteroides has chopped its nose off despite its face, other species in the crock that love lower pH conditions, like Lactobacillus plantarum and Luteimonas cucumeris, wake up and shine! They get active digesting stuff, transforming stuff, creating their own styles of acids that then lower the pH even more. They have their time in the limelight and then the conditions become intolerable to them (again by their own activity!) and they stagnate. But those low low pH conditions are perfect for the next round of fermenting bacteria to set up shop and Lactobacillus brevis begin their heyday creating their own signature acids.   With each wave of microbial activity, a new set of compounds is created and it is the layering of these compounds in succession that creates the complex health attributes and delicious characteristics of finely made sauerkraut. One would not throw a cabbage into a crock with only the last round of bacteria and expect it to yield the same delightful results as a ferment that has gone through all of the natural stages of complex fermentation . No no no.   And this explains why we don’t advocate continuously brewing kombucha. In our years of experience in home fermenting and commercially brewing kombucha, we have never tasted a kombucha made using the continuous brewing method that meets our standards for a robust, complex and delightful 'buch. Continuous brewed kombucha results in a profile that skews toward too much acetic acid. You can tell because it tastes like vinegar.   Not only that, but kombucha cultures that have at some point in the their history gone through a period of continuous brewing seem to lose the ability to ferment at the earlier stages altogether – the cultures seem to have lost the pioneering species and have become concentrated with the microbial species typical of later stages of fermentation. You can always tell a SCOBY has a continuous brew heritage by the immediate formation of the “vinegar” flavor that is characteristic of acetic acid just hours after a new batch is inoculated. This is not the kombucha that we like to drink and we think it may not have the same nutritive characteristics as those that are allowed to go through all stages of fermentation in batch brewing. We have also never seen a SCOBY recover their pioneering abilities.   If you are in the market for a new SCOBY, we highly recommend you start with a SCOBY guaranteed to have never been used to continuously brew kombucha. Your crock, palette and belly will thank you.

Science vs. the Kombucha Mythos

Science vs. the Kombucha Mythos 0

Most kombucha brewers are aware, to an extent, of the prevalence of hearsay and unfounded rhetoric surrounding every facet of the kombucha experience. The ongoing conversations are what fuels, to a great extent, the content of this particular blog, while also contributing to a modern kombucha mythos.  

Power of direct experience

  To be absolutely honest, though, so much content must be experiential due to the simple fact that obtaining actual research on the subject of kombucha can be difficult. The small amount of research that has been done can be difficult or expensive to access. The things we discover in our own experiences, or those of others, are excellent sources. Experiential data holds great weight for home brewers.   Sure, it can be useful to cite x or y article that references the 'buch. These impressions will always exist, and the weight we contribute to them is of course a matter of our own willingness to accept or reject these and other sometimes unfounded suppositions. As with any data on the internet, though, check your sources.  

Reports that hold salt

  There is some excellent data we can all point towards, either to support or helpfully reject some facets of our experiential understanding. Excellent sources include a number of books and scientific papers.   One great source we've recently discovered, though, is a portal to all sorts of scientific knowledge previously accessible only to those willing to pay for it. However, we see that the idealization of the free flow of information has issued into a vast majority of science literature being made freely available. An article about the woman behind this democratizing action, and a link to her eye-opening project can be found here. A simple search for "kombucha" on her hub yields quite a number of papers that point to scientifically-tested aspects of our favorite beverage.   The ever-useful Reddit also has a section titled Scholar - and, doing a quick search for "kombucha" here can bring up a good amount of scientifically-verified data on the 'buch!   Kombucha cohorts over at the Happy Herbalist have compiled a useful page as well, citing some of these studies, which can be found here. Referenced is one of the major studies about kombucha, performed by Michael Roussin, for example. In his research, one of many things he revealed is that caffeine content of teas is not affected by fermentation. It is notable that this research runs contrary to the popular belief that kombucha fermentation helps to mitigate caffeine from the tea's infusion - good information for those with caffeine allergies to know before embarking on a brewing project, but also a great example of the potential of science to debunk a common bit of kombucha mythology.  

In conclusion

  As with many things in our own lives, the phrase "you decide your own level of involvement" rings loud and clear when we attempt to build up our knowledge base with regards to kombucha. Our own direct experience can be incredibly powerful, but when bolstered by scientific findings, we can come much closer to a full-circle understanding that enriches our brewing experience and propels our lives towards vitality and happiness. Happy brewing!
The Kombucha SCOBY Demystified

The Kombucha SCOBY Demystified 9

Sinking, Floating, and Fusing

  To the un-initiated, the orientation of the kombucha SCOBY can be a mystifying ponderance. Shouldn't it float at the top? If it sinks, will the brew fail? The answers really are much more of an indifference to chaos than a culture control regimen.  


SCOBY has sunken to the bottom of the brew vessel  


The mother SCOBY you used to start your new brew should be considered different from the resulting, new SCOBY that grows on the surface of your new brew. Let's call that original the mother, and the new one (that will begin to form on the surface) the baby. When you start your brew, adding the mother to the sweet tea, that original culture may float, at the surface, it may sink, or it may just hover in the middle. Any of these orientations is 100% okay and should not be considered indicative of viability. The mother will potentially fuse together with the baby, too, and that's fine. The SCOBY doesn't have a mind of its own, it's not drowning if it sinks and it's not dangerous if it floats before the baby has a chance to start growing. Much more indicative of brew health is the level of sweetness, which should decrease with time, and acidity, which should increase.  

Two original SCOBYs have fused with the new baby, this is normal. No need to call Ellen Ripley.


Disappearing SCOBY

  Most of the time, when I hear that someone's SCOBY has disappeared, the issue is very simple. Just bumping your fermentation vessel while it is brewing is enough to cause the SCOBY to sink below the surface of the tea. So, whereas previously there was a thin baby growing on the surface, it will now have "disappeared." It's very often likely that a little disturbance caused the culture to sink, potentially not being visible in the tea below. But remember, taste your brew throughout the fermentation process so you can tell if it is progressing or not. Nearly 100% of the time it is, and any speculation or fear of failure is unfounded.  

Bumped jar scenario; you can see the older SCOBY below a newer layer on the surface; when this happens with a much thinner surface layer, often it can fold up and be imperceptible under the surface.


Your SCOBY after the First Brew

  After your first brew, you'll likely have 2 types of culture you will deal with. One will be the original, or mother, culture - this will obviously not always be a single, coherent piece - maybe you picked up 2 pieces of culture from a friend, or got one of our 3-gallon ceramic deluxe kits with 3 SCOBYs, or just used shards of SCOBY from another brew - this culture can all be considered the mother.  

Cultures have fused together, mother and baby together in one.  

So, you will have the mother and the baby, which will be the new culture that will have formed. Please note as well - new culture will always grow on the surface, and you can't grow kombucha SCOBY underneath the surface of the tea. Yeast tendrils may form in the liquid, but you won't see new SCOBY forming in the liquid.  

Tendrils, Dark Spots, Bubbles, Oh My!

  These are all things that cause trepidation on the part of new brewers, but once you get used to the strange things you'll see, that initial skepticism will turn to awe every time you brew!  

 Yeast strands, totally normal; think of them as SCOBY hair

 SCOBY yeast can often look slimy and even green - this is fine!


And below, the classic and spine-tingling Brown Visitor. Be careful when peeking at your brew before bedtime.  

The Brown Visitor is just a conglomeration of yeast, and your SCOBY will probably grow around it. Bubbles are usually involved around the glob, too.


Below, also, are some common brown visitors. The specks on the surface (left) are often yeast granules that are at times tough and grainy, but are totally normal. On the right are just bits of tea that didn't get strained out during steeping.  

Specks in the SCOBY


 And finally, the giant SCOBY. Simply the result of a long fermentation time, there's nothing to fear here. The kombucha below this one will likely be pretty sour, but both parts can be used as normal. The kombucha as vinegar or starter, and the culture as a mother, backup or foodstuff.  

Thick SCOBY is the result of vigorous metabolism and usually a long ferment 

Don't Freak Out!

  So, next time your brew is weirding you out, remember that SCOBY lead lives of their own and don't bow to our expectations of understanding. If any of the above troubles you, let it be laid to rest. Remember that the ultimate test of a successful brew is good fun and great taste. Happy brewing!  
  Check out this blog post if you think your kombucha SCOBY may be performing in less savory fashions, i.e. growing mold  
Holiday Shipping Dates

Holiday Shipping Dates 0

Getting nervous about how late you can order from KBBK and still have it under the tree for Christmas morning? Our carriers have declared that if you order by the dates on this map, they will be able to get your package to these locations before Dec 25th. If you're looking for last minute gifts after these dates, we have expedited shipping options  

We will be shipping orders until Dec 23rd.  Give us a call if you need help getting an order together.   

Happy holiday brewing!



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