Met 12-fase r/o water, zijn de watertemperaturen in de lage tot midden 70 graden. Het probleem lijkt zich op de onderste bladeren voor te doen. Ik gebruik cal/mag.
Was there a point in time your ph was off? On old lower leaves I usually ignore unless I see the problem spreading. Old damaged leaves don't repair so always look to new growth to see if a problem has been corrected. 🤘😤