Process of Making Brew Dr. Kombucha
We get asked a lot about the process of making Brew Dr. Kombucha. We love to tell our story, so we thought we’d put together a brief virtual tour of our brewery. Along with the photos below is a fairly in-depth description of how we do what we do, including how we stay true to producing authentic kombucha while managing the alcohol that is created in kombucha fermentation.
We started making Kombucha in the kitchen of our Townshend’s Portland Teahouse location in 2008. We expanded into the basement of our Portland Teahouse for about a year, and then moved into our first brewery space in 2009. In early 2016 we completed a big upgrade into 60,000 total square feet of production space. Every part of the Brew Dr. Kombucha production process is done in house, leaf to bottle.Pictured below is the brewing area. Here we blend our recipes of organic tea and botanicals to create each of our current flavors. We put all our ingredients loose into these brew tanks. We add hot water, organic cane sugar, and steep essentially a really big pot of sweetened tea for an hour. That allows enough time for the flavor of all the dried herbs, roots and fruits to come out. This is really the most important step. We use the same high-quality organic tea and botanicals in our Kombucha that we serve to guests at our teahouses. This is where our entire flavor profile comes from. This point on the batch is dedicated by flavor into a dedicated tank. We don’t add juice or flavors after fermentation. Because we started as a tea company, we take a very “tea” approach to making Kombucha taste great. Once we’ve got a great tasting tea we pump it over into the fermentation room.
We started out in 5-gallon fermentation containers, then we went to 75 gallons, then 250, then 900 gallons. The fermentation tanks in the next photo hold 9,000 gallons each. The tanks have cloth-topped large vent ports on top and we keep the air moving constantly while holding a room temperature of about 75 degrees. Our batches take around 2 to 4 weeks to ferment. Once the batch passes our quality checks and we are satisfied, we pump the Kombucha over to a chilled holding area. Can’t rush the good stuff.
The next stop on our brewery tour is a room full of chilled holding tanks. The finished Kombucha is pumped into one of these tanks and quickly refrigerated down to around 33 degrees. At this point it is ready for alcohol adjustment. We ferment Kombucha in an authentic, traditional way. That’s how we believe raw Kombucha should be made, and we believe it’s how our customers expect it to be made. Because we use a traditional process, the Kombucha at this point has an alcohol content anywhere from 1% to 3% alcohol by volume.
In order to make authentic raw Kombucha that abides by alcohol regulations, we utilize a technology that removes alcohol from liquids without the use of excessive heat. The machine pictured below is called a Spinning Cone Column. It is a method of distillation and as such our Kombucha brewery is a licensed distillery as well. Okay science time–here’s how it works:
Our Kombucha is pumped into the top of the column. Inside the column, the atmospheric pressure is reduced to the point where ethanol (aka alcohol) atomizes at a very low temperature, around 98 degrees. The column is heated to that temperature and as the Kombucha trickles down through the column, the ethanol starts to atomize or turn into a gaseous state. The ethanol moves up to the top and over into a secondary chilled column where it turns from gas back into a liquid. The Kombucha passes out the bottom of the column and thus maintaining all of its live and active cultures. The only difference is the ethanol has been removed to the point where the Kombucha now has an alcohol content of around 0.1%. Now we’ve got authentic, raw Kombucha with naturally occurring live and active cultures that is legal to sell as a non-alcoholic beverage.
The byproduct of this method of non-heat driven distillation is a lovely high-proof distillate that is made entirely of organic ingredients. This unique solution to solving the alcohol issue in raw Kombucha provided us with the opportunity to create the world’s first tea spirits. We named the distillery Townshend’s after our teahouses. The botanical spirits arm makes eight spirits all using a specific Kombucha as the base for each spirit. View the award winning products at Townshend’s Distillery.Once the Kombucha has had its alcohol removed, it is put back into a chilled holding tank until we are ready to bottle it. Below you can see our current bottling line. As of May 2017 we are producing around 350,000 bottles every week and we expect to be making about twice that by the end of the year.
Because we have gone to the trouble of removing the alcohol, we need to keep our Kombucha cold enough that further fermentation doesn’t occur. Therefore we utilize a bottling process similar to craft beer. Our Kombucha is put into chilled “brite” tanks where it is gently carbonated overnight. It is bottled at 33 degrees and moved into cold storage immediately afterward. This way we ensure our distributors and retail partners get consistent, non-alcoholic Kombucha.
We prefer this over bottle conditioning (also called “secondary fermentation”), where you would leave the Kombucha at room temperature for some days after bottling in order to carbonate, creates an inconsistent level of fizziness as well as increased alcohol content. It also creates the little globule you see in some Kombuchas–that’s a little SCOBY (symbiotic colony of bacteria and yeast), which is the cellulose mat that grows at the top of every Kombucha batch. Some customers ask us why our Kombucha doesn’t have “that slimy floaty thing” in the bottle and we use that as a chance to educate them on the difference between bottle conditioning and our method of consistent carbonation with a controlled alcohol content.
That’s how we make every bottle of our beloved Brew Dr. Kombucha. We hope you agree that our ‘no shortcuts’ approach is well worth the effort. We are committed to keeping our Kombucha an authentic, raw beverage that is full of the naturally-occurring live and active cultures our fans expect. Cheers from the whole family!