A concentration unit used in cannabis cultivation either for nutrient solution strength (as an alternative to EC) or for CO2 level measurement in the grow room.
Dakota monitors CO2 PPM on the room sensor, noting it reads 779 PPM on first check and crosses 800 PPM shortly after, at which point the controller shuts off the CO2 flow. During the day-11 update the CO2 is at 1100 PPM and day 3 flower it is referenced as running well.
Discussed in: Ep 004