@EVERYTHINGFRIEDISGOOD because you are not changing the solution it is just building up in unused
salts thus the increase in your EC / PPM
the plant takes what it needs and leaves what it doesn't and when you just add more to the solution
instead of changing it occasionally it certain nutrients build up and cause the high levels
So change your nutes out every now and then
or risk loss of yield and problematic growing experience ๐