From a fellow grower:
I’ve built an aeroponic system and there will be a lot of evaporation. I am assuming that the feeding schedule you provided will work as long as the water is continuously kept at increments of full gallons. Otherwise tests strips will need to be utilized in order to make sure the correct ph values are present.
I am worried about adding water to the system which will be required, as it may create a situation where the water is concentrated and might create a runaway pH.