DoDad
Member
Oh sorry
That quarter to half runoff is after the 1 gallon Rez has been flushed with new solution. Sorry for the confusion.
I'm not the expert here but wouldn't those nutes hold the same PPM/PH even after runoff?
I know when I change my recirculating rez that my PH and PPM seem the same as when I put them in there even after being well used for over a week.
Maybe when capture your runoff, keep that runoff from being exposed to air and light and you might be able to use that runoff again the next time you water after a check of PH and PPM?