Draw part of the tank, refill the rest, let the culture carry on. A share of professional kombucha houses work this way, and the vinegar trade has done it in an acetator for a century. It also has no batch: no start, no end, and nothing for a food-safety record to attach itself to. BrauMo answers that with the cycle.
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Brewing software counts batches. A vessel refilled indefinitely has one batch that never closes, so every number hanging off it slowly stops being true, and every control point fires once at the beginning and never again.
A regulator's own example kombucha plan makes "add water and starter, then measure the pH" its first critical control point, after combining and before fermenting. In a batch that fires once. In a vessel that is never emptied it fires at every refill, forever, because each refill dilutes the acid barrier back toward the limit. BrauMo judges every one of them.
However many cleared before it. And a refill nobody measured is not a quiet pass: it reads as unmeasured, because a hurdle cannot be cleared by silence. The printed record and the PDF both say which cycle failed and why.
Every input to a batch's volume subtracts, which is correct for something that can only empty and silently wrong for a vessel topped back up. Draws and refills are one timeline, so the litres in the tank, the yield and the cumulative throughput agree with each other and with what you actually poured.
The largest refill that stays under your pH limit, learned from that vessel's own cycles. No coefficient ships with the app: pH is logarithmic and buffered, the buffering depends on your tea, your sugar and your culture, and a constant would be wrong exactly where being wrong matters. It stays quiet until the vessel has given it three usable cycles, and quiet again if the answer comes out unusable.
BrauMo documents, flags and reports. It never blocks a refill and never decides for you, and where a figure has not been measured it says so instead of showing you one it invented.
The decisions behind BrauMo, applied to a way of brewing nobody wrote software for.
BrauMo runs on your own computer and serves every phone and tablet on the local network. Logging a refill at the tank does not depend on the wifi holding.
One database file, in your house, owned by you. No cloud account, no telemetry, nothing of yours on somebody else's servers.
English, German, Spanish and Portuguese: every screen and every document, built by a working fermentation producer and answered by the same person.
Continuous vessels are not a module and carry no surcharge. One price per producer, unlimited users, every feature, from EU €59 to Latin America US$29 a month.
