“It takes 9 to 10 gallons of water to make one gallon of beer”
Where does this water go? It just doesn’t disappear. H²O even at the atomic level is retained. Just like carbon is.
Into the sewer system. It is dirty water used for cleaning, etc.
I know about this because a local brewery was being mischarged for their water usage and conversely for their sewer fees. The city sued them for the missing usage. They used a figure of number of gallons produce time 9 to come up with the initial number.
It actually was the city’s fault and there was paper trail going back several years noting that the city sewer dept knew about it but had done nothing to fix the problem. It was a simple fix of putting an additional meter on a pipe that had not been installed when the plant was expanded.