So once it hits 8 gallons marked on tub, wave makers turn off and can prop it up with a 2x4 to use the last 5 gallons until it will run out of water to pump which can feed 3 times guessing if to feed 5x per day in flower or close to that. I would then refill it with new solution.
If to need to rotate for shelf life reasons, I have a space cabinet that can use the rest of this so I dont even have to make solution for it unless it is due for cleaning.
That, or just top it off with 32 gallons fresh solution. Still need to confirm how many gallons it can hold total with lid on it, could be a few gallons less. Trade industry likes to change measurements on things.
One wave maker for waves to stir and one for aeration. Goal is to make it last a whole week as manufacture suggests discarding after a week. Maxi series.
So far seems to be a solid build that is rewarding me already. Short and wide resivoirs due to avoiding siphoning so the resivoir had to be that way as pots sit tall enough, don’t want to waste tall space just for a tall and narrow resivoir.