![\"Kombucha\"](\"https:\/\/micetbrewing.com\/wp-content\/uploads\/2026\/05\/Kombucha.webp\" "\\"\\"")
Zusammenfassung<\/h2>\n\n- Kombucha starts with brewed tea, sugar, starter liquid, and a living culture of bacteria and yeast.<\/li>\n
- The visible SCOBY is only one part of the culture; previously fermented kombucha also carries active microorganisms and helps acidify a new batch.<\/li>\n
- The first fermentation develops acidity and the main flavor profile, while the second fermentation is often used for flavoring and carbonation.<\/li>\n
- Temperature, time, pH, sugar, oxygen exposure, and culture health all influence product consistency.<\/li>\n
- Commercial producers need hygienic tanks, validated cleaning procedures, temperature control, testing, traceable recipes, and suitable packaging equipment.<\/li>\n
- In the United States, kombucha that reaches 0.5% alcohol by volume or more at any time may fall under TTB alcohol regulations, including continued fermentation after packaging.<\/li>\n<\/ul>\n
Artikel Gliederung<\/h2>\n\n- What is kombucha, and why is it brewed from tea?<\/li>\n
- What are a SCOBY and kombucha starter?<\/li>\n
- How does kombucha fermentation work?<\/li>\n
- How do you make kombucha during the first fermentation?<\/li>\n
- What happens during secondary fermentation?<\/li>\n
- How do tea, sugar, and flavor ingredients affect the recipe?<\/li>\n
- What equipment is needed for home and commercial production?<\/li>\n
- How do commercial fermentation tanks improve control?<\/li>\n
- How should producers manage food safety, pH, and alcohol?<\/li>\n
- How do you plan a turnkey kombucha brewing line?<\/li>\n<\/ol>\n
1. What Is Kombucha, and Why Is It Brewed From Tea?<\/h2>\n
Kombucha is a fermented tea made by combining brewed tea, sugar, starter liquid, and a mixed culture of bacteria and yeast. The finished drink is usually tart, slightly sweet, and lightly sparkling. Producers may sell it unflavored or blend it with herbs, spices, fruit juice, or other permitted ingredients.<\/p>\n
Traditional kombucha tea often begins with black tea or green tea. The tea provides flavor, color, nitrogen compounds, minerals, and plant-derived compounds that support the process. Sugar provides the main energy source for the microorganisms.<\/p>\n
Colorado State University Extension describes kombucha as a lightly effervescent beverage made by fermenting sweetened tea with a starter culture of bacteria and yeasts. Its home-production guidance also notes that the process commonly takes about 7\u201310 days, although actual fermentation times may extend longer depending on conditions.<\/p>\n
Kombucha is not simply cold tea with added flavor. It is an active biological product. The microorganisms continue to change the liquid during production and may keep working after filling unless the producer controls temperature, culture activity, sugar, and packaging conditions.<\/p>\n
This continued activity creates both opportunity and risk. It can improve flavor complexity and natural carbonation, but it can also cause rising pressure, excess acidity, or a higher alcohol content.<\/p>\n
2. What Are a SCOBY, Starter Tea, and Kombucha Culture?<\/h2>\n
SCOBY commonly means symbiotic culture of bacteria and yeast. It often appears as a pale, rubbery cellulose layer that forms across the surface of the tea.<\/p>\n
The visible layer is sometimes called a kombucha mushroom, but it is not a true mushroom. It is a microbial cellulose structure formed during the fermentation process.<\/p>\n
A healthy culture may contain several yeast and bacterial species. The exact mix varies between suppliers, regions, recipes, and production environments. Research reviews describe kombucha as a complex microbial system in which yeast breaks down sugar and produces ethanol, while acetic acid bacteria convert part of the ethanol into acids.<\/p>\n
Is the SCOBY the same as starter liquid?<\/h3>\n
Not exactly.<\/p>\n
The solid kombucha SCOBY contains microorganisms, but the liquid from a mature batch is also highly important. This liquid is commonly called:<\/p>\n
\n- Kombucha starter<\/li>\n
- Startertee<\/li>\n
- Kombucha starter liquid<\/li>\n
- Previously fermented kombucha<\/li>\n
- Kombucha starter culture<\/li>\n<\/ul>\n
The starter lowers the initial pH and introduces an active microbial population into the new sweetened tea. A visible pellicle alone does not provide complete process control.<\/p>\n
For home brewing, people often use both starter tea and SCOBY. In commercial production, liquid culture management, microbial consistency, acidity, and batch records may matter more than the appearance of the cellulose layer.<\/p>\n
What is a SCOBY hotel?<\/h3>\n
A SCOBY hotel is a container used to store extra culture layers in mature, acidic kombucha. It can provide backup culture for the next batch.<\/p>\n
This idea is useful at a small scale, but a commercial producer should manage starter culture more systematically. Large facilities may establish controlled culture-propagation procedures, lot identification, sensory checks, pH records, and microbiological specifications.<\/p>\n
3. How Does Kombucha Fermentation Work?<\/h2>\n
The kombucha fermentation process begins when the culture enters cooled, sweetened tea.<\/p>\n
Yeast produces enzymes that break sucrose into simpler sugars. The yeast then converts part of those sugars into ethanol and carbon dioxide. Acetic acid bacteria use oxygen and convert part of the ethanol into acetic acid and other compounds.<\/p>\n
A simplified process looks like this:<\/p>\n
Tea + sugar\r\n \u2193\r\nYeast activity\r\n \u2193\r\nSimple sugars \u2192 ethanol + carbon dioxide\r\n \u2193\r\nBacterial activity\r\n \u2193\r\nOrganic acids + changing flavor and acidity\r\n<\/code><\/pre>\nThe real process is more complex because different microorganisms interact at the same time. Their activity depends on:<\/p>\n
\n- Tea type<\/li>\n
- Sugar concentration<\/li>\n
- Starter strength<\/li>\n
- Temperature<\/li>\n
- Oxygen availability<\/li>\n
- Dauer der G\u00e4rung<\/li>\n
- Vessel geometry<\/li>\n
- Culture history<\/li>\n
- Cleaning conditions<\/li>\n<\/ul>\n
During primary fermentation, acidity generally rises while sweetness falls. The beverage may develop notes that range from fruity and mild to sharp and vinegar-like.<\/p>\n
A longer fermentation does not automatically mean better quality. If the product ferments too long, it may become too acidic for the intended flavor profile. If it stops too early, it may remain overly sweet or biologically unstable.<\/p>\n
Does kombucha always contain alcohol?<\/h3>\n
The process can produce alcohol because yeast converts sugar into ethanol. The final amount varies widely.<\/p>\n
Temperature, yeast activity, sugar level, oxygen, tank depth, time, filtration, refrigeration, and continued fermentation all influence the final alcohol content.<\/p>\n
In the United States, the Alcohol and Tobacco Tax and Trade Bureau states that kombucha is regulated as an alcohol beverage if it reaches 0.5% alcohol by volume or more during production, at bottling, or after bottling.<\/p>\n
This makes alcohol testing an important operating control, not just a labeling question.<\/p>\n![\"\"](\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" "\\"\\"")
What Is Kombucha Brewing? How to Brew Kombucha and Manage Fermentation<\/figcaption><\/figure>\n4. How Do You Make Kombucha During the First Fermentation?<\/h2>\n
The following process explains the basic principle of brewing kombucha at home. It is not a substitute for a validated commercial process or local food-safety requirements.<\/p>\n
Basic kombucha recipe process<\/h3>\n\n- Heat clean water.<\/li>\n
- Steep suitable tea leaves or tea bags.<\/li>\n
- Remove the tea.<\/li>\n
- Dissolve sugar while the liquid is warm.<\/li>\n
- Allow the sweetened tea to cool to room temperature.<\/li>\n
- Transfer it to a clean food-grade vessel.<\/li>\n
- Add kombucha starter liquid.<\/li>\n
- Add the culture.<\/li>\n
- Cover the opening with a clean, breathable cloth.<\/li>\n
- Secure with a rubber band.<\/li>\n
- Allow the mixture to ferment.<\/li>\n
- Taste and test it before packaging.<\/li>\n<\/ol>\n
The cloth allows air exchange while helping keep out insects and debris. An airtight lid is normally not used during traditional first fermentation because acetic acid bacteria benefit from oxygen.<\/p>\n
Colorado State University Extension recommends using a clean fine-weave cover or coffee filter and lists glass, suitable stainless steel, and food-grade plastic as possible brewing-vessel materials. It also stresses cooling the tea before adding the living culture.<\/p>\n
Adding a culture to hot tea can damage the microorganisms. The sweet tea should therefore cool fully before the kombucha starter and SCOBY are introduced.<\/p>\n
What happens during first fermentation?<\/h3>\n
The first fermentation, also called primary fermentation, establishes the main kombucha flavor and acidity.<\/p>\n
During this stage:<\/p>\n
\n- Yeast begins consuming sugar.<\/li>\n
- Bacteria produce acids.<\/li>\n
- A new SCOBY may form on the surface.<\/li>\n
- The tea becomes less sweet.<\/li>\n
- The flavor becomes more tart.<\/li>\n
- Small amounts of carbon dioxide and alcohol may develop.<\/li>\n<\/ul>\n
The ideal end point is recipe-specific. It should be based on documented sensory, pH, sugar, acidity, and alcohol targets rather than on a fixed number of days alone.<\/p>\n
Room temperature varies greatly between homes and regions. A recipe that performs well in a cool room may ferment much faster in a warm production area.<\/p>\n
5. What Happens During Secondary Fermentation and Carbonation?<\/h2>\n
After the main fermentation, producers may transfer the liquid into pressure-capable kombucha bottles or a closed tank. Fruit, herbs, extracts, or other flavor ingredients may be added at this stage.<\/p>\n
This is commonly called the second fermentation or secondary fermentation.<\/p>\n
Residual sugar and added fruit can support continued fermentation. Carbon dioxide becomes trapped in the sealed package, creating natural carbonation.<\/p>\n
First vs. second fermentation<\/h3>\n
Artikel Gliederung<\/h2>\n\n- What is kombucha, and why is it brewed from tea?<\/li>\n
- What are a SCOBY and kombucha starter?<\/li>\n
- How does kombucha fermentation work?<\/li>\n
- How do you make kombucha during the first fermentation?<\/li>\n
- What happens during secondary fermentation?<\/li>\n
- How do tea, sugar, and flavor ingredients affect the recipe?<\/li>\n
- What equipment is needed for home and commercial production?<\/li>\n
- How do commercial fermentation tanks improve control?<\/li>\n
- How should producers manage food safety, pH, and alcohol?<\/li>\n
- How do you plan a turnkey kombucha brewing line?<\/li>\n<\/ol>\n
1. What Is Kombucha, and Why Is It Brewed From Tea?<\/h2>\n
Kombucha is a fermented tea made by combining brewed tea, sugar, starter liquid, and a mixed culture of bacteria and yeast. The finished drink is usually tart, slightly sweet, and lightly sparkling. Producers may sell it unflavored or blend it with herbs, spices, fruit juice, or other permitted ingredients.<\/p>\n
Traditional kombucha tea often begins with black tea or green tea. The tea provides flavor, color, nitrogen compounds, minerals, and plant-derived compounds that support the process. Sugar provides the main energy source for the microorganisms.<\/p>\n
Colorado State University Extension describes kombucha as a lightly effervescent beverage made by fermenting sweetened tea with a starter culture of bacteria and yeasts. Its home-production guidance also notes that the process commonly takes about 7\u201310 days, although actual fermentation times may extend longer depending on conditions.<\/p>\n
Kombucha is not simply cold tea with added flavor. It is an active biological product. The microorganisms continue to change the liquid during production and may keep working after filling unless the producer controls temperature, culture activity, sugar, and packaging conditions.<\/p>\n
This continued activity creates both opportunity and risk. It can improve flavor complexity and natural carbonation, but it can also cause rising pressure, excess acidity, or a higher alcohol content.<\/p>\n
2. What Are a SCOBY, Starter Tea, and Kombucha Culture?<\/h2>\n
SCOBY commonly means symbiotic culture of bacteria and yeast. It often appears as a pale, rubbery cellulose layer that forms across the surface of the tea.<\/p>\n
The visible layer is sometimes called a kombucha mushroom, but it is not a true mushroom. It is a microbial cellulose structure formed during the fermentation process.<\/p>\n
A healthy culture may contain several yeast and bacterial species. The exact mix varies between suppliers, regions, recipes, and production environments. Research reviews describe kombucha as a complex microbial system in which yeast breaks down sugar and produces ethanol, while acetic acid bacteria convert part of the ethanol into acids.<\/p>\n
Is the SCOBY the same as starter liquid?<\/h3>\n
Not exactly.<\/p>\n
The solid kombucha SCOBY contains microorganisms, but the liquid from a mature batch is also highly important. This liquid is commonly called:<\/p>\n
\n- Kombucha starter<\/li>\n
- Startertee<\/li>\n
- Kombucha starter liquid<\/li>\n
- Previously fermented kombucha<\/li>\n
- Kombucha starter culture<\/li>\n<\/ul>\n
The starter lowers the initial pH and introduces an active microbial population into the new sweetened tea. A visible pellicle alone does not provide complete process control.<\/p>\n
For home brewing, people often use both starter tea and SCOBY. In commercial production, liquid culture management, microbial consistency, acidity, and batch records may matter more than the appearance of the cellulose layer.<\/p>\n
What is a SCOBY hotel?<\/h3>\n
A SCOBY hotel is a container used to store extra culture layers in mature, acidic kombucha. It can provide backup culture for the next batch.<\/p>\n
This idea is useful at a small scale, but a commercial producer should manage starter culture more systematically. Large facilities may establish controlled culture-propagation procedures, lot identification, sensory checks, pH records, and microbiological specifications.<\/p>\n
3. How Does Kombucha Fermentation Work?<\/h2>\n
The kombucha fermentation process begins when the culture enters cooled, sweetened tea.<\/p>\n
Yeast produces enzymes that break sucrose into simpler sugars. The yeast then converts part of those sugars into ethanol and carbon dioxide. Acetic acid bacteria use oxygen and convert part of the ethanol into acetic acid and other compounds.<\/p>\n
A simplified process looks like this:<\/p>\n
Tea + sugar\r\n \u2193\r\nYeast activity\r\n \u2193\r\nSimple sugars \u2192 ethanol + carbon dioxide\r\n \u2193\r\nBacterial activity\r\n \u2193\r\nOrganic acids + changing flavor and acidity\r\n<\/code><\/pre>\nThe real process is more complex because different microorganisms interact at the same time. Their activity depends on:<\/p>\n
\n- Tea type<\/li>\n
- Sugar concentration<\/li>\n
- Starter strength<\/li>\n
- Temperature<\/li>\n
- Oxygen availability<\/li>\n
- Dauer der G\u00e4rung<\/li>\n
- Vessel geometry<\/li>\n
- Culture history<\/li>\n
- Cleaning conditions<\/li>\n<\/ul>\n
During primary fermentation, acidity generally rises while sweetness falls. The beverage may develop notes that range from fruity and mild to sharp and vinegar-like.<\/p>\n
A longer fermentation does not automatically mean better quality. If the product ferments too long, it may become too acidic for the intended flavor profile. If it stops too early, it may remain overly sweet or biologically unstable.<\/p>\n
Does kombucha always contain alcohol?<\/h3>\n
The process can produce alcohol because yeast converts sugar into ethanol. The final amount varies widely.<\/p>\n
Temperature, yeast activity, sugar level, oxygen, tank depth, time, filtration, refrigeration, and continued fermentation all influence the final alcohol content.<\/p>\n
In the United States, the Alcohol and Tobacco Tax and Trade Bureau states that kombucha is regulated as an alcohol beverage if it reaches 0.5% alcohol by volume or more during production, at bottling, or after bottling.<\/p>\n
This makes alcohol testing an important operating control, not just a labeling question.<\/p>\nWhat Is Kombucha Brewing? How to Brew Kombucha and Manage Fermentation<\/figcaption><\/figure>\n4. How Do You Make Kombucha During the First Fermentation?<\/h2>\n
The following process explains the basic principle of brewing kombucha at home. It is not a substitute for a validated commercial process or local food-safety requirements.<\/p>\n
Basic kombucha recipe process<\/h3>\n\n- Heat clean water.<\/li>\n
- Steep suitable tea leaves or tea bags.<\/li>\n
- Remove the tea.<\/li>\n
- Dissolve sugar while the liquid is warm.<\/li>\n
- Allow the sweetened tea to cool to room temperature.<\/li>\n
- Transfer it to a clean food-grade vessel.<\/li>\n
- Add kombucha starter liquid.<\/li>\n
- Add the culture.<\/li>\n
- Cover the opening with a clean, breathable cloth.<\/li>\n
- Secure with a rubber band.<\/li>\n
- Allow the mixture to ferment.<\/li>\n
- Taste and test it before packaging.<\/li>\n<\/ol>\n
The cloth allows air exchange while helping keep out insects and debris. An airtight lid is normally not used during traditional first fermentation because acetic acid bacteria benefit from oxygen.<\/p>\n
Colorado State University Extension recommends using a clean fine-weave cover or coffee filter and lists glass, suitable stainless steel, and food-grade plastic as possible brewing-vessel materials. It also stresses cooling the tea before adding the living culture.<\/p>\n
Adding a culture to hot tea can damage the microorganisms. The sweet tea should therefore cool fully before the kombucha starter and SCOBY are introduced.<\/p>\n
What happens during first fermentation?<\/h3>\n
The first fermentation, also called primary fermentation, establishes the main kombucha flavor and acidity.<\/p>\n
During this stage:<\/p>\n
\n- Yeast begins consuming sugar.<\/li>\n
- Bacteria produce acids.<\/li>\n
- A new SCOBY may form on the surface.<\/li>\n
- The tea becomes less sweet.<\/li>\n
- The flavor becomes more tart.<\/li>\n
- Small amounts of carbon dioxide and alcohol may develop.<\/li>\n<\/ul>\n
The ideal end point is recipe-specific. It should be based on documented sensory, pH, sugar, acidity, and alcohol targets rather than on a fixed number of days alone.<\/p>\n
Room temperature varies greatly between homes and regions. A recipe that performs well in a cool room may ferment much faster in a warm production area.<\/p>\n
5. What Happens During Secondary Fermentation and Carbonation?<\/h2>\n
After the main fermentation, producers may transfer the liquid into pressure-capable kombucha bottles or a closed tank. Fruit, herbs, extracts, or other flavor ingredients may be added at this stage.<\/p>\n
This is commonly called the second fermentation or secondary fermentation.<\/p>\n
Residual sugar and added fruit can support continued fermentation. Carbon dioxide becomes trapped in the sealed package, creating natural carbonation.<\/p>\n
First vs. second fermentation<\/h3>\n
1. What Is Kombucha, and Why Is It Brewed From Tea?<\/h2>\n
Kombucha is a fermented tea made by combining brewed tea, sugar, starter liquid, and a mixed culture of bacteria and yeast. The finished drink is usually tart, slightly sweet, and lightly sparkling. Producers may sell it unflavored or blend it with herbs, spices, fruit juice, or other permitted ingredients.<\/p>\n
Traditional kombucha tea often begins with black tea or green tea. The tea provides flavor, color, nitrogen compounds, minerals, and plant-derived compounds that support the process. Sugar provides the main energy source for the microorganisms.<\/p>\n
Colorado State University Extension describes kombucha as a lightly effervescent beverage made by fermenting sweetened tea with a starter culture of bacteria and yeasts. Its home-production guidance also notes that the process commonly takes about 7\u201310 days, although actual fermentation times may extend longer depending on conditions.<\/p>\n
Kombucha is not simply cold tea with added flavor. It is an active biological product. The microorganisms continue to change the liquid during production and may keep working after filling unless the producer controls temperature, culture activity, sugar, and packaging conditions.<\/p>\n
This continued activity creates both opportunity and risk. It can improve flavor complexity and natural carbonation, but it can also cause rising pressure, excess acidity, or a higher alcohol content.<\/p>\n
2. What Are a SCOBY, Starter Tea, and Kombucha Culture?<\/h2>\n
SCOBY commonly means symbiotic culture of bacteria and yeast. It often appears as a pale, rubbery cellulose layer that forms across the surface of the tea.<\/p>\n
The visible layer is sometimes called a kombucha mushroom, but it is not a true mushroom. It is a microbial cellulose structure formed during the fermentation process.<\/p>\n
A healthy culture may contain several yeast and bacterial species. The exact mix varies between suppliers, regions, recipes, and production environments. Research reviews describe kombucha as a complex microbial system in which yeast breaks down sugar and produces ethanol, while acetic acid bacteria convert part of the ethanol into acids.<\/p>\n
Is the SCOBY the same as starter liquid?<\/h3>\n
Not exactly.<\/p>\n
The solid kombucha SCOBY contains microorganisms, but the liquid from a mature batch is also highly important. This liquid is commonly called:<\/p>\n
- \n
- Kombucha starter<\/li>\n
- Startertee<\/li>\n
- Kombucha starter liquid<\/li>\n
- Previously fermented kombucha<\/li>\n
- Kombucha starter culture<\/li>\n<\/ul>\n
The starter lowers the initial pH and introduces an active microbial population into the new sweetened tea. A visible pellicle alone does not provide complete process control.<\/p>\n
For home brewing, people often use both starter tea and SCOBY. In commercial production, liquid culture management, microbial consistency, acidity, and batch records may matter more than the appearance of the cellulose layer.<\/p>\n
What is a SCOBY hotel?<\/h3>\n
A SCOBY hotel is a container used to store extra culture layers in mature, acidic kombucha. It can provide backup culture for the next batch.<\/p>\n
This idea is useful at a small scale, but a commercial producer should manage starter culture more systematically. Large facilities may establish controlled culture-propagation procedures, lot identification, sensory checks, pH records, and microbiological specifications.<\/p>\n
3. How Does Kombucha Fermentation Work?<\/h2>\n
The kombucha fermentation process begins when the culture enters cooled, sweetened tea.<\/p>\n
Yeast produces enzymes that break sucrose into simpler sugars. The yeast then converts part of those sugars into ethanol and carbon dioxide. Acetic acid bacteria use oxygen and convert part of the ethanol into acetic acid and other compounds.<\/p>\n
A simplified process looks like this:<\/p>\n
Tea + sugar\r\n \u2193\r\nYeast activity\r\n \u2193\r\nSimple sugars \u2192 ethanol + carbon dioxide\r\n \u2193\r\nBacterial activity\r\n \u2193\r\nOrganic acids + changing flavor and acidity\r\n<\/code><\/pre>\nThe real process is more complex because different microorganisms interact at the same time. Their activity depends on:<\/p>\n
- \n
- Tea type<\/li>\n
- Sugar concentration<\/li>\n
- Starter strength<\/li>\n
- Temperature<\/li>\n
- Oxygen availability<\/li>\n
- Dauer der G\u00e4rung<\/li>\n
- Vessel geometry<\/li>\n
- Culture history<\/li>\n
- Cleaning conditions<\/li>\n<\/ul>\n
During primary fermentation, acidity generally rises while sweetness falls. The beverage may develop notes that range from fruity and mild to sharp and vinegar-like.<\/p>\n
A longer fermentation does not automatically mean better quality. If the product ferments too long, it may become too acidic for the intended flavor profile. If it stops too early, it may remain overly sweet or biologically unstable.<\/p>\n
Does kombucha always contain alcohol?<\/h3>\n
The process can produce alcohol because yeast converts sugar into ethanol. The final amount varies widely.<\/p>\n
Temperature, yeast activity, sugar level, oxygen, tank depth, time, filtration, refrigeration, and continued fermentation all influence the final alcohol content.<\/p>\n
In the United States, the Alcohol and Tobacco Tax and Trade Bureau states that kombucha is regulated as an alcohol beverage if it reaches 0.5% alcohol by volume or more during production, at bottling, or after bottling.<\/p>\n
This makes alcohol testing an important operating control, not just a labeling question.<\/p>\n
What Is Kombucha Brewing? How to Brew Kombucha and Manage Fermentation<\/figcaption><\/figure>\n 4. How Do You Make Kombucha During the First Fermentation?<\/h2>\n
The following process explains the basic principle of brewing kombucha at home. It is not a substitute for a validated commercial process or local food-safety requirements.<\/p>\n
Basic kombucha recipe process<\/h3>\n
- \n
- Heat clean water.<\/li>\n
- Steep suitable tea leaves or tea bags.<\/li>\n
- Remove the tea.<\/li>\n
- Dissolve sugar while the liquid is warm.<\/li>\n
- Allow the sweetened tea to cool to room temperature.<\/li>\n
- Transfer it to a clean food-grade vessel.<\/li>\n
- Add kombucha starter liquid.<\/li>\n
- Add the culture.<\/li>\n
- Cover the opening with a clean, breathable cloth.<\/li>\n
- Secure with a rubber band.<\/li>\n
- Allow the mixture to ferment.<\/li>\n
- Taste and test it before packaging.<\/li>\n<\/ol>\n
The cloth allows air exchange while helping keep out insects and debris. An airtight lid is normally not used during traditional first fermentation because acetic acid bacteria benefit from oxygen.<\/p>\n
Colorado State University Extension recommends using a clean fine-weave cover or coffee filter and lists glass, suitable stainless steel, and food-grade plastic as possible brewing-vessel materials. It also stresses cooling the tea before adding the living culture.<\/p>\n
Adding a culture to hot tea can damage the microorganisms. The sweet tea should therefore cool fully before the kombucha starter and SCOBY are introduced.<\/p>\n
What happens during first fermentation?<\/h3>\n
The first fermentation, also called primary fermentation, establishes the main kombucha flavor and acidity.<\/p>\n
During this stage:<\/p>\n
- \n
- Yeast begins consuming sugar.<\/li>\n
- Bacteria produce acids.<\/li>\n
- A new SCOBY may form on the surface.<\/li>\n
- The tea becomes less sweet.<\/li>\n
- The flavor becomes more tart.<\/li>\n
- Small amounts of carbon dioxide and alcohol may develop.<\/li>\n<\/ul>\n
The ideal end point is recipe-specific. It should be based on documented sensory, pH, sugar, acidity, and alcohol targets rather than on a fixed number of days alone.<\/p>\n
Room temperature varies greatly between homes and regions. A recipe that performs well in a cool room may ferment much faster in a warm production area.<\/p>\n
5. What Happens During Secondary Fermentation and Carbonation?<\/h2>\n
After the main fermentation, producers may transfer the liquid into pressure-capable kombucha bottles or a closed tank. Fruit, herbs, extracts, or other flavor ingredients may be added at this stage.<\/p>\n
This is commonly called the second fermentation or secondary fermentation.<\/p>\n
Residual sugar and added fruit can support continued fermentation. Carbon dioxide becomes trapped in the sealed package, creating natural carbonation.<\/p>\n
First vs. second fermentation<\/h3>\n
![\"\"](\"https:\/\/micetbrewing.com\/wp-content\/smush-webp\/2026\/03\/How-to-Select-a-Suitable-Kombucha-Fermentation-Tank.jpg.webp\" "\\"\\"")
![\"\"](\"https:\/\/micetbrewing.com\/wp-content\/smush-webp\/2026\/03\/\u4f01\u4e1a\u5fae\u4fe1\u622a\u56fe_17739234655623.png.webp\" "\\"\\"")
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<\/p>\n![\"Used](\"https:\/\/micetbrewing.com\/wp-content\/smush-webp\/2026\/02\/1-1-4-1024x883.jpg.webp\" "\\"\\"")
<\/p>\n