Back in the day(15-20 years ago)some friend’s and I grew in the custom made, hybrid DWC/Sprinkler systems…long story short one of my friend’s got Pythium a few time’s…what we used back then was a product called Subdue Maxx from Dow…it even worked on Pythium Blight! Didn’t get rid of it but would manage the disease enough to finish a crop…
Then intensive cleaning! Pythium Blight is systemic so in every cell of the plant…imagine cleaning everything top to bottom just to miss a tiny little piece of leaf that finds it’s way back into your res and re-contaminates the grow once again!! Seen it happen…
These day’s I wouldn’t use Subdue Maxx as contains some nasty stuff…TBH I’m not even sure a safe product to use…I’m guessing there are a few ones to be found though.
Not saying you have Pythium Blight…but might have one of the lesser forms of it…something you definitely want to keep an eye on my friend!
Alaskagrown