How to Make Kombucha in Canada (SCOBY Method)

Commercial kombucha in Canada runs $4 to $6 per 500 mL bottle at Whole Foods, Loblaws, or Sobeys. The same volume from a home brew costs roughly $0.30 in tea and sugar — a 90 percent savings, plus full control over flavour and sweetness. The catch is the 10-day production cycle and the SCOBY-maintenance ritual. Once you’re set up, the rhythm is easy.

This guide covers the standard 4 L continuous-brew method with black tea, the swing-top second ferment for soda-level carbonation, and the safety pH verification this site recommends.

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What a SCOBY is

SCOBY stands for “symbiotic colony of bacteria and yeast.” It’s a thick, rubbery, cream-coloured disc that grows on the surface of fermenting sweet tea. The bacteria (mostly Acetobacter) consume the alcohol that the yeast produces and turn it into acetic acid (vinegar). The yeasts consume sugar and produce alcohol and CO2.

The result is sweet tea fermented into a tangy, mildly fizzy, mildly alcoholic probiotic beverage. How much alcohol is left is not something a home batch measures — see the alcohol section below before deciding who in the house drinks it. The SCOBY itself isn’t eaten — it’s the workhorse that you keep through batch after batch.

A healthy SCOBY:

• Floats or sinks; both are normal
• Forms a new white layer (the “baby”) on top with each batch
• Smells slightly vinegary
• Looks cream-coloured with some brown streaks (yeast strings)

An unhealthy SCOBY:

• Has fuzzy, coloured mould (green, black, pink, blue) on the surface — discard the batch
• Smells rotten or sulphurous — discard
• Has dissolved into the brew — not necessarily ruined, but compromised

Where to get a SCOBY in Canada

• Cultures for Health (culturesforhealth.com) — ships dehydrated SCOBYs. About $17–25 CAD.
• Local fermenting communities — every major Canadian city has Facebook groups where extras are shared free.
• Grow your own from raw store-bought kombucha (GT’s Synergy, Health-Ade — must be raw/unpasteurized). Mix 1 cup raw kombucha + 1 cup cooled sweet tea, cover with breathable cloth, wait 2 to 4 weeks for a SCOBY to form.
• Don’t buy from anonymous Amazon listings — quality unpredictable.

What you need

For one 4 L batch:

• SCOBY (4 to 8 cm diameter)
• 1 to 2 cups starter kombucha (comes with the SCOBY, or reserve from previous batches)
• 8 black tea bags OR 4 tbsp loose-leaf black tea
• 1 cup organic cane sugar — raw, brown, or white
• 4 L filtered water — chlorine kills the SCOBY
• 4 L glass jar (gallon-size pickle jar or large Mason jar)
• Breathable cloth and rubber band
• Plastic strainer (avoid metal, which corrodes SCOBY over time)
• Swing-top bottles for second ferment (Grolsch-style)
• pH test strips — BCCDC’s window is 4.2 or lower and never below 2.5; we aim for 3.5

The first ferment (7 to 14 days)

1. Brew strong sweet tea. Bring 2 L water to a boil. Steep 8 tea bags for 10 minutes. Remove bags. Dissolve 1 cup sugar.
2. Cool to room temperature. Add 2 L cold filtered water. Verify under 30 °C — hot tea kills the SCOBY.
3. Pour into glass jar. Add starter kombucha (1 to 2 cups).
4. Add SCOBY. May sink, float, or sit sideways. All normal.
5. Cover with breathable cloth and secure with rubber band. Never seal during first ferment — air access required.
6. Ferment at 18 to 22 °C for 7 to 14 days. Don’t disturb the SCOBY. A new white baby SCOBY forms on top.
7. Taste at day 7 with a straw (don’t dip anything). Should be tart, slightly sweet, mildly fizzy.
8. Verify pH with a test strip. Aim for 3.5 — inside BCCDC’s 4.2-to-2.5 window.
9. Remove SCOBY to a clean jar with 2 cups reserved kombucha for the next batch.

The second ferment (for fizz)

1. Pour first-ferment kombucha into swing-top bottles, leaving 3 to 5 cm headspace.
2. Add flavour: 1/4 cup fresh juice per 1 L OR 2 tbsp dried fruit.
3. Seal tightly and ferment 24 to 72 hours at room temperature.
4. Burp daily to release excess pressure.
5. Refrigerate when desired fizz is reached.

Flavour combinations

Ginger-lemon (classic)

1 tbsp grated fresh ginger + juice of half a lemon per 1 L.

Berry blast

1/4 cup mixed fresh berries (strawberry, raspberry, blueberry) per 1 L.

Pomegranate-rose

1/4 cup pomegranate juice + 1 tsp dried rose petals per 1 L.

Mint-cucumber

1 sprig fresh mint + 4 thin slices cucumber per 1 L.

Maple-ginger (Canadian)

1 tbsp pure maple syrup + 1 tbsp grated ginger per 1 L.

Hibiscus-lime

1 tbsp dried hibiscus + 2 lime slices per 1 L.

Apple-cinnamon

1/4 cup apple juice + 1 cinnamon stick per 1 L.

Continuous-brew method

Once you’ve done 2 to 3 batch brews, switch to continuous brewing:

1. Use a 4 L glass dispenser with a spigot.
2. Maintain a constant 2 L of brewing kombucha + SCOBY.
3. Draw off 1 to 2 cups at a time from the spigot.
4. Top up with fresh sweet tea (cooled) to replace.
5. The pH stays stable; the SCOBY stays healthy; you have kombucha ready any day.

Continuous brew is the standard for households drinking kombucha regularly.

Safety: the pH window, and its floor

The BC Centre for Disease Control’s Fermented Food Guidance publishes a window for kombucha and jun rather than a single threshold, and the half nobody states is the bottom of it:

“ferment to a pH of 4.2 or lower. Do not ferment to a pH lower than 2.5”

The floor is the only pH figure they attach to a named illness. BCCDC: “excess acids during prolonged fermentation, when pH is 2.5 or lower, can cause illness in susceptible individuals. This very low pH and daily consumption of teas have led to metabolic acidosis concerns in vulnerable populations, although rare.” If you like your kombucha sour and ferment longer to get it, that is the direction you are walking — and it is the hazard this page had never mentioned.

Their pathogen figure is separate and higher than either: bacterial pathogens and spores “are unlikely to survive in the high acid content of kombucha and jun, once a low enough pH (pH of 4.6 or less) is achieved during fermentation.”

We aim for pH 3.5, and that is our number inside BCCDC’s window rather than a threshold anyone publishes. It sits below their 4.2 target and well above their 2.5 floor, which is why we keep it. Verify with test strips at the end of each first ferment.

• Above 4.2 — ferment longer (3 to 5 more days) and re-test. A stall usually means a sluggish culture: cold room, chlorinated water, or too little starter.
• At or below 2.5 — BCCDC’s instruction is not to ferment there. The illness they name comes from that acidity plus daily drinking, so a batch that has gone below the floor is not a daily drink: use it as kombucha vinegar for dressings, or discard it. More sour is not safer.
• Cannot measure at all — Québec’s rule applies: “When in doubt, throw it out!”

Alcohol, and who should not drink this

Kombucha contains alcohol. The yeasts make it and the bacteria convert most of it to acid — but “most” is not “all”, and how much survives in your jar is not something a home batch measures.

Federal regulations require 1.1 percent or less alcohol in a non-alcoholic beverage. That is the published limit and it is a commercial one: a bottle on a shelf has been tested, and yours has not. BCCDC records a BC survey in which over 30 percent of kombucha samples collected were not compliant in managing alcohol content, and over 70 percent of local BC processors failed to control alcohol levels in kombucha tea. Those are licensed operators with equipment and lab access. A jar on a kitchen counter has neither, and the sealed second ferment — more sugar, no air — is the step that makes more alcohol rather than less.

BCCDC recommends that kombucha carry the precautionary statement “may contain alcohol. Not a suitable beverage for young children or during pregnancy.” The Public Health Agency of Canada recommends that alcohol is not consumed during pregnancy, and that youth delay drinking alcohol.

The figure that makes this concrete is a body weight. BCCDC: “Alcohol toxicity is a concern in young children, and especially those weighing 10 kg or less, who are vulnerable to even low doses of alcohol.” Their own worked example: at 2 percent alcohol, 200 mL — less than one cup — would exceed the 50 mg/dL amount in a 10 kg or lighter child. Young children lack alcohol dehydrogenase and metabolise ethanol poorly, and BCCDC notes that confusion, overheating and fatigue can read to a caregiver as something other than alcohol.

Health Canada is in that record too, for this position rather than against it: BCCDC writes that Health Canada “acknowledges ethanol in non-alcoholic fermented beverages as a concern in kombucha, kefir, and some soft drinks including ginger beer.”

Common problems

• SCOBY sinks and stays at bottom. Normal for a new SCOBY in fresh tea. It’ll rise eventually as fermentation produces CO2.
• Brown stringy strands in the brew. Yeast cells — harmless. Strain before second ferment if desired.
• Mould on the SCOBY surface. Fuzzy, coloured patches mean discard the entire batch and the SCOBY. Start over with a fresh SCOBY.
• Kombucha is too sweet after 14 days. SCOBY weak or temperature too cold. Add more starter; warm to 22 °C.
• Kombucha is too sour / vinegary. Over-fermented. Use this batch as salad-dressing kombucha vinegar.
• Bottles exploded during second ferment. Pressure too high. Burp daily. Use swing-tops rated for carbonation.
• No fizz after second ferment. Not enough sugar source. Add more fruit juice; ferment longer.
• Kombucha smells off (sulphur, rotten). Discard the entire batch and the SCOBY.

When to make this

Year-round. Kombucha is climate-independent. Many Canadians keep continuous-brew vessels going year-round on a kitchen counter rotation.

Next steps

• How to make water kefir in Canada — the dairy-free probiotic soda alternative
• How to make ginger bug in Canada — wild-fermentation soda starter
• How to make sauerkraut in Canada — the gateway lacto-ferment
• Best fermenting crock in Canada — equipment guide
• Fermenting & root cellaring pillar — broader method context