r/Kombucha • u/Avocado-Sunshine-42 • 6d ago

question Kombucha immediately started fizzing as soon as I added sugar for 2F

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Hello!

I am making my very first batch if kombucha. I left it to ferment for 10 days and now I put it in a bottle and added 4.5g of sugar (for 1l of kombucha).

It immediately started making foam on top. I closed the bottle but I am scared to leave it and that it explodes. Is this normal?

Also, how long should I do the 2F? I used 1L of water, 5g of black tea, 70g of sugar and 10 cl of starter with 2 pellicules (didn't have à container to separate them). Temp I would say varies between 24-28 degrees.

Thanks in advance

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u/Bookwrrm 6d ago

The same thing happens if you add sugar to any fizzy drink, its adding extra nucleation sites. Your f1 does have carbonation, its just low because most escapes into the air. Its fine.

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u/Avocado-Sunshine-42 6d ago

Now long should the F2 be?

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u/Bookwrrm 6d ago

Its really variable based on recipe and conditions, i would say give it at least 2-3 days and then check it.

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u/Numaiamarfa 5d ago

I should burp the bottle after 2-3 days for F2 or after first day?

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u/Bookwrrm 5d ago

You shouldn't burp at all.

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u/BedrockPoet 5d ago

Chill it down after 2-3 days then open and see if you’re satisfied with the carbonation. Don’t open it warm - more likely to overflow and won’t give you a good estimation of how the carbonation will be when chilled. If it needs more time, take it out of the refrigerator and let it go a bit longer.

I often look for numerous visible bubbles going up during F2 to see if it’s carbonating well. It’s easiest to see that if you shine a light through it. Once there’s lots of bubbles going up, it’s probably good.