Get a hydrometer or refractometer to measure the SG or Brix of your fruit juice, and factor in the dilution when you add it to your Kombucha. 1 Brix is 1g of sucrose in 100g of liquid, you should then be able to use a carbonation tool (free online) to figure out the rest. Just a little backwards calculating.When you add fruit at bottling it will carb up. We have not gotten this down to an exact science regarding C02 volumes.
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