One of the fail safe's I thought I saw, predetermined when a socket could be available. So say I wanted to start dosing at 8 am for 3 min. I could lock out the socket from doing anything if it wasn't, say 7:59 - 8:05. If that first condition was met (the clock read anywhere from 7:59 to 8:05), then it could move onto the actual program. If something went wrong with the program, the worst case scenario is I'd dose for 6 min (7:59-805 when that first condition shut the socket down) instead of an hour or more or, eek until the bottle was empty - thus killing the tank.
Maybe what I was looking at was overly complicated or I totally didn't understand it, lol.
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