The default method: Single Cycle Kombucha or Jun tea fermentation typically recommends starting with somewhere between a 1 to 5 and 1 to 10 ratio of existing starter liquid and tea feedstock.
The Galaxy Brain method: Continuous Fermentation is a specific method where you never empty your primary container, rarely clean it (if ever), and never dilute the culture by more than 2x the volume in a single feeding — maintaining acidity levels and therefore safety.