Yes, this is the kind of patience I've been talking about. Makes you heave a big sigh when it finally does something...
The A-Bac colony has to not only get large enough to handle the normal stuff but must also process the excess coming in from the tap water - these are always longer and more difficult ones. But you've got the first glimpse that you're getting there. I hope it will continue to be zero for you.
~~waterdrop~~