RO membrane gph rating determines your micrometer size. higher waste flow is usually due to a higher filtering ratio.
my RO system accepts generic filters and membranes. if i use a smaller micrometer filter i get less gph and a lower ppm, and more waste water.
the real test is the ppm after...
at this point it's seeded. a lot of the damage has been done. i'd try hang on but remove as many of the nanners as you can. they'll keep showing up now too.
pull as soon as you can stand the trichs.
a simple spray down and wipe everything with a favorite mild cleaner will do it. even...
leave autos at 18/6 or higher for daylight hours. 17 and under will slow development and allow it to go longer. allowing it to go longer increases the likelihood of a hermie developing.
autos like long daylight hours at a lower level than would be run for photo plants.
depends on the fungus. 2:1 water to milk is the common powdery mildew mix. 1:1 lemon mix is often preferred for others. the milk spray is supposed to work best with sunlight but it does work under hid and led as well. lemon works everywhere.
it's an auto. they stress super easy and hermie. the yellow part at the bottom of your pic is a male flower that has already opened and distributed pollen.
run off ph will tell you next to nothing. it's the inputs that matter
simply mix lemon juice with water or milk 50/50 and use as a spray. don't worried about the ph of the spray mix.
wiping the leaves down with a mild milk solution will do it. lemon juice can take it out as well. it's the mild natural acids that will kill it if is fungal.
i've got the same thing going on right now. i'm just watching for the moment to see it it's ongoing.
did you have them near a fan ? what ph are you feeding them at ? not watering to runoff will spike ph in a soil pot.
edit : black is fungal infection, stress ( wind or light ), and ph. almost always a combination, not just one thing. i'm hoping you missed the fungal infection. that would...
looks like a ph issue or a nute excess. the feeding practices followed here would indicate ph trouble. if they were weak when they got sprayed down that would also take a bunch of leaves out.
won't be mold if the rh is low.
could probably get by with just a mild late stage booster for flower and a little cal-mag.
you won't be able to simply jump in with a full nute program when using a nuted soil intended for start to finish. more than a good chance it will burn up the plants. you are right on top of finish...
if growing outdoor only this is the answer. just leave them there and they will reveg on their own.
this used to be done on purpose when you could only get regs to get rid of the males when the plants showed sex. the rest would reveg and continue. sometimes results in gnarly plant that...